I'm not sure that he does accelerate when he's holding the sword actually. Listen to the engine note: the bike slows down, then he changes down a gear to go up the ramp. At most that needs the clutch (left hand) but on most bikes you can do it clutchless if you judge the revs right.
The effects are very good; I particularly like the standing water right at the beginning. There's something not right about the way he runs though. It's too regular, like a running machine rather than a real person.
Logic-wise, why are the missiles so slow, and why do they only start to shoot at him after chasing him for several minutes at the same distance? I like the missiles' pulsed vertical jet lift though, which is very remeniscent of the Dragon ATGW.