Being in a fight with Decepticons was one thing but fighting three Alone was another, not to mention being more then aware of Other Decepticons fighting your team, that's also not counting how you could see Nemesis fighting someone who? You didn't have time to find out before having to battle Starscream and his Trine(Thundercracker and Skywarp), even if you wanted a peaceful way out that didn't seem to be an option