The hit wasn't clean.
Ivan's blow connected. One more blinding flash followed. But something wasn't right. It felt like he had tried punching through layers upon layers of cushion and glass.
The former made sense.
Casey's power was related to kinetic energy transference and vibrations.
She could do wondrous things with it — like absorbing the force of an incoming impact and converting it into raw potential energy to store inside her body.
She could then release it all later in explosive counter-bursts of superspeed and superstrength.
That's why she was a pain in the ass to deal with for any hand-to-hand combatant. The more force you hit her with, the harder she'd hit you back.
That's also why she defeated Reiner Tovak so easily while somewhat struggling against the silver-haired Bishop. It was a bad matchup.
