your life has never been threatened by another person and it shows. the kid probably was feeling a rush of both fear and then self confidence because he successfully defended himself, which manifested in clowning on the fucker who was trying to kill him. it’s very easy for you to judge and diagnose him from behind your screen but if you were in the situation, how do you know you’d act differently? or more likely you’d probably cower in the corner and get yourself killed because you’re too concerned with the intruder’s feelings to do anything about it