What does Peter threaten to do to Ender and Valentine? In Enders game.

Peter threatens to kill them. Peter is the sort of boy who likes torturing small animals. He gets his kicks out of the control of it all. Peter threatens to kill both his siblings. He likes to instil fear in them and play with their minds. I think Ender, initially is a little more afraid of Peter. Valentine is creped out but is able to verbally spar with her. Peter definitely has the beginnings of a socio-path going on.