I might be over thinking, or the movie was just moving to fast during this scene. Is there any particular reason why Galvatron fled the scene when Lockdown arrived and shot down Optimus? Galvatron at this time as we all know seem to have gain sentience and life during the small brawl with prime. So would there be any reason why Galvatron wouldn't want to confront Lockdown and make some sort of deal with him instead of leaving the scene? Did he knew Lockdown was this "big bad of all transformers?" Or... Like I said was I just over thinking, and he followed KSI commands to continues on working on his army towards the end.