He Ao estimated that there might be a 'counteraction' rule, so he remotely used his Divine Sense to control the folding knife and touched the button.
Compared to direct throwing, the Divine Sense has a kind of 'autonomy,' making it seem as if it can move on its own.
This might lead to a misjudgment of the rule, treating the folding knife as the 'subject' and confiscating it.
That's equivalent to exploiting a bug.
He Ao originally estimated that the most likely event was some sort of 'attack' on the person who unlocked the button. He did not expect the rule to be 'exchange,' which coincidentally exploited the rule's loophole.
This had a bit of luck involved.
Of course, if unlucky, he would just be caught, and then Finn would save him, or they'd just find another kid to 'exchange' with.
Once you understand the rules, as long as you follow them, there will always be a solution.
The most dangerous thing is when the rules are unclear.
