Thrust loves to fight, as long as he's guaranteed to win. As soon as the odds turn against the Decepticons, he's the first to run and hide. He relishes the chance to push around those smaller and weaker than him, so earth is the ultimate playground. He avoids the Autobots completely, choosing instead to pick fights with small, lightly armed groups of human. Even then, as soon as the humans roll out any artillery, or even rocket launchers, he heads for space, to lay low until he can stop shaking from fear.