She left him tied up fully clothed, presumably ambushed on the way to school. Didn't bother to remove his belongings. Rookie mistake for anyone else. Apparently sufficient for him. The useless shit couldn't even make half an attempt at escaping.
I can say without a shadow of a doubt that I would have at least spent several hours forcing my way out of those ropes (I do carry things with me on a daily basis that could, with a little effort, cut through ropes)... and assuming I actually got free the next step would be to burn her fucking house down.