If the first phase of the boss fight ends directly right from the helipad at the slight downward slope section then the 2nd phase of the boss fight can be finished up to 2 seconds faster than if you were to kill phase 1 at any other point. It sounds ridiculous but it's completely consistent. Now if only could find out how to skip the whole damn thing... Oh yeah, and there's no room for a 4:37 here as far as I'm concerned.