Ryan had been trotting to the ambush site some distance behind Alan and Christine, staying close to the bushes so that they wouldn't see his pursuit. This caused him to miss Aaron's takedown, because the tree and Alan ended up blocking his view of Christine's sudden, violent attack.
When he saw that Aaron was motionless and that Rock and Ivan were just standing around, he got pissed. At least Alan and Christine were trapped in this corner of the schoolyard with nowhere to go. He'd heard that Christine had some martial arts training, so he decided that she needed to be taken out immediately; they could pound Alan afterward.
He accelerated into a sprint, going near the racquetball courts to avoid the others and get a clear shot at Christine, intending to slam into her with his football pads and immobilize her. At the same time he yelled, "Ivan, help me with Christine! Let Rock handle Alan."
Christine was in her 'fight mode', assessing everything quickly and rapidly, choosing her next action without emotion or self-reflection. She barely broke stride as Ryan rushed toward her, instead driving almost straight into him while extending her arm out to the side to lead his reaching hand away from his body. Simultaneously, her other hand rose up from between them, starting near his waist, shooting toward his neck while avoiding his shoulder pads.
This was not the reaction Ryan had expected to his charge. His time sense slowed while he closely tracked that nearer hand, which seemed ready to assault his neck. It did not, but moved lightly past, merely brushing his skin, and then drove sharply back and down. Next thing he knew, he was landing flat on his butt, with the fall mostly cushioned by his pads.
She'd stiffened that arm while at the same moment moving from her hips diagonally forward under his extended arm and past his body, sweeping his shoulders backward, behind his hips, unbalancing him and letting gravity do the rest. His focus on the hand that seemingly was assaulting his neck had let her lead his mind, which led his body - a basic Aikido technique that not even a trained mind could resist. He hadn't stopped her; in fact he'd barely slowed her advance toward Rock and Alan.
It was at that point that Ivan arrived. He tried grabbing both her arms.
She responded almost automatically, as a result of years of training, by stepping into him with her right arm coming down above his left while her left arm rose up underneath his right, at the same moment that she diverted right to sidestep him on the side of the descending arm.
This forced him to twist sideways while her dual, opposing arm motions split his attention. He found himself taking a dive along the plane of his descending arm, on the receiving end of an Aikido takedown throw.
She disconnected from him as he tumbled past her, which left him rolling away, attempting to protect his head from impact.
When Ryan called Ivan away to help with Christine, Alan suddenly realized, Hey, Rock is ignoring me! He's just bending over that giant dude. He realized that Rock was alone and vulnerable now that the other football player was gone. He might be able to help Christine and take out one of their attackers. Alan's adrenaline surged again. He's the guy behind this attack! This is my chance! Get him!
With that, Alan charged around the giant's head, straight toward Rock.
Although Rock stood up and turned when he saw Alan approach, his astonishment at actually being attacked by an intended victim let Alan get in the first blow, which was to Rock's jaw.
Unfortunately, Alan didn't know what he was doing, so that his blow ended up hurting his own knuckles more than Rock's jaw. Then they were at such close quarters that the two of them could only trade body blows. Rock hit Alan hard in the chest and arms. Alan quickly found himself on the defensive.
Christine was dismayed when she saw that Alan had run over to Rock and started fighting. Although she appreciated Alan's bravery in trying to help, in fact it just made things more difficult for her; now she would have to defeat their three remaining opponents without maiming them while simultaneously trying to keep Alan from getting hurt.
She started to move hurriedly towards Alan and Rock, but at that moment Ryan was on her again.
Ryan had scrambled to his feet and rushed at Christine while she was still dealing with Ivan. She saw him coming and raised her fists, making it difficult for him to anticipate her next move.
Christine knew that Ryan was the one who had attacked Alan in the stairwell. His instructions to Ivan a few moments earlier showed that he was coordinating this attack as well.
She was sorely tempted to teach him a lesson while taking him out of the fight for good, jamming her elbow into his solar plexus before pivoting rapidly and using her hip muscles to power the heel of her other hand at maximal speed and force diagonally upward against his jaw, snapping his head backward and sideways in a corkscrew motion to concuss him and give him whiplash. But she held back, because she had decided to avoid seriously injuring her schoolmates.
He grabbed both her wrists from behind, using his stronger muscles and greater weight to pull her arms behind her, figuring that might incapacitate her.
She had let him grab her like that because it would give her the opportunity to dominate him psychologically so completely that he would have to realize the futility of fighting with her. (She would not realize until later how much her Wonder Woman fixation had influenced this dangerous decision to let her hands be pulled behind her back.)
As soon as Ryan pulled her wrists together behind her, she grabbed his now-adjacent left wrist with her right hand, then spun to the right, clockwise, while bending her left wrist upward. Her whole-body motion, originating in her hips, pried her left hand out of his grip as she continued turning, because her wrist grab had coupled his pin of her right wrist to his own left arm, making it impossible for him to hang onto her left wrist as she spun in place.
As she completed the turn, facing him, she brought her now freed left hand into play. She grabbed his left hand which her right hand still held at the wrist, bent his fingers in on themselves in a manner that torqued his wrist, then used her hips to apply irresistible leverage, forcing him to turn sideways to her and fall on his back to prevent her from dislocating his wrist or elbow. In doing this she was very careful to align and control her movement correctly, because she knew that a mistake in this technique could tear his wrist and elbow ligaments or spiral-fracture his forearm.
Ryan thought, Geez, she's strong! It was all basic Aikido, pitting her hip muscles plus gravity against his much weaker arm joints. He didn't know the one non-obvious move that could counter her attack.
Once he was on the ground, Christine walked his captive arm rapidly around his head while still holding it up, opening his shoulder and forcing him to roll over onto his stomach. Pressing down on the back of his hand, she put more pressure on his bent, twisted wrist and (through his locked arm) his now-vulnerable shoulder, demonstrating who was in control. She pressed gently but with increasing firmness until his concern that she would dislocate or break one of those joints overcame his determination to not give in. Very reluctantly, he had no choice but to submit. He cried out, "STOP! I GIVE!"
It was only at that point that she relented, releasing the pressure. To disengage, she placed his hand in the middle of his back (so that he couldn't grab for her), then rapidly stepped away. Once again, his pads hadn't protected him at all.
After taking Ryan down a second time, Christine moved hurriedly toward Rock and Alan, who were still fighting. She was frustrated, because putting Ryan down in such a dominating way while avoiding seriously hurting him had taken a few valuable seconds, and meanwhile Alan was getting punched. She was confident that she could defeat their aggressors, but she didn't want Alan to get seriously injured in the process.
Ivan was on his feet again in time to see the conclusion of Ryan's second attack. He felt that there wasn't much point in going after her again by himself after what he'd just seen her do to Ryan, and whatever had happened earlier to Aaron, so he followed her but kept his distance, hoping that she might offer a better opportunity when she was preoccupied with someone else.