I have one more guess but I can’t find corresponding strip right now.
I think it's the fact that they don't realise immediately that the victim has caught the "culprit", but I don't think they have a comic for that.
UuuSo which of us is the culprit?I was in the library the whole time!UuuHmmKnh!Catch her!L-let me go!Magicians have no alibis!The Suspected WomanDoes it have to be one of us?Looks like Patche has to be the culprit!Yes! I knew you could do it, Sakuya!The culprit's escaped!I have secured her.