The Autobots didn't see Megatron suddenly appearing out of nowhere heading for Optimus & Sentinel on the bridge? I mean they could have thought that Megatron was about to join in the fight with Sentinel against Optimus, they might never know. Well, the rest of Autobots might be busy fighting other Decepticons or tackling pillars or shouting to one another to GET DAH PILLARZ DOWN, but a huge rusty truck with a shotgun in the hand is rather prominent in a battle zone right? But anyway, when the pillars were down, Megatron was proposing a truce to Optimus, what were the rest of the Autobots doing? o_o Taking their own sweet time and stroll to the bridge or standing at one end of the bridge and watch Optimus throw an axe into Megatron's face and then shoot their former leader in the face twice?