The bird is dead, and I am very sorry for that. But you have a bigger issue if a 13 year old is hurting small animals just because something upset him. If you suspect that he is capable of such things, then the kid has issues that must be addressed. It is a sign of mental problems that can lead to much worse. When I first read the post I thought maybe he was a very young child that may have accidentally hurt the bird, but this is much more sinister.