I think the problem is that many youngsters do not always think through what consequences might be of certain actions..I think that sometimes films and TV give them a false perspective.Which is why the lad never thought that your bike would actually hurt him until it did.
I wonder how many walking around with knives in their pockets actually realise how easy it is to kill and expect victims to spring up and leg it to a hospital.I really think that they do not visualise what happens next.They only go so far with their planning and no further.
It's the only way I can account for some really moronic behaviour on tha part of some students that I teach.They tend only to live in the moment and cannot visualise what happens next.The Jackass school of life so to speak..
I bet these two scrotes can't believe that this woman is dead because they won't think they hurt her that much..