---------- The fact that Megatron saved Optimus' ass and went ahead to claim authority over him, subsequently having his spine ripped out. ---------- actually Megatron did NOT wanted to save Optimus, Megatron saw Sentinel as a threat to his Leadership cause if they won he would be Sentinel bitch. thus he went to attack Sentinel for regain leadership, his mistake was attacking him before Sentinel could finish off Optimus. in early drafts he did saved optimus, but in the movie he just attacked Sentinel for regain leadership, not for save Optimus.