... would have been the most incredibly naive and costly thing Prime could ever have done. Let's look at Meg's history: Betrayed the Transformers civilization and plunged them all into a war that killed almost all of the Autobots and countless Decepticons and ruined Cybertron. Motivation? Personal power. Pursued the All-Spark relentlessly across the galaxy in order to claim it and use its power to destroy and enslave other races - plus wipe out the Autobot survivors. Motivation? Personal power. Allied with The Fallen and attempted to destroy the entire solar system, killing 5+ billion sentient lifeforms. Motivation? Personal power. Tore Jazz in half. Sneak-killed Optimus Prime from behind in the forest. Forged a deal/truce with Sentinel, one Sentinel went for to save Cybertron - the planet Megatron had pretty much destroyed for his own personal power. His Decepticons then slaughtered Chicago, murdering civilians in the streets by the thousands. The plan? Enslave and largely kill/destroy 5+ billion sentient lifeforms to rebuild his stolen empire. Betrayed the last guy he made a truce with by backstabbing and attacking him right in front of Prime. Sure, nice inadvertent side-effect for Prime was that it took Sentinel away from executing Prime, but Megs did not "save Prime" (not his intent) - he attacked Sentinel by surprise in order to betray him in that truce. So now we have Megs, after having done all of the above attrocities and mere moments after betraying the last guy he had a truce with, call for a truce so that he could be in charge (personal power, tyranny). And I'm sure conditions and plans of Meg's truce would have included leaving the humans alone. He's totally cool with being equals/subservient to humans and not at all trying to wipe them out in some attempt to return the Decepticons to glory and dominance, with him as tyrant. ... and Prime was supposed to say "OK, put 'er there ole' chum!"? So instead Prime says "No way you lying, betraying, mass-murdering sack o' crap" and attacks. He lands the first blow too, and it's a doozy. Only blow needed, thanks to Meg's badly damaged head. Han shot first in this battle and won. So I guess I don't totally get why some people think Prime should have accepted a truce from Megs after all that, under those conditions, and with a guy who had 0% chance of doing anything OTHER than betraying, killing, and then some more genocide for breakfast. But yeah, Prime totally should have shook Megs hand and enjoyed that there truce. That would have gone great.