in this case it seems more like he would muster up the courage to do something nasty instead of just "snapping"
and yeah, there's no way to tell if he would actually go there I seem to remember reading something a while ago (and if this is wrong, forgive me, my memory sucks) that said that there are a lot of sick freaks like this in the world, and only a few actually went the extra mile. Either that, or they didn't get caught.
still, it would be hard just to walk away from someone like that, ya know?