Ben saves Kai from raging flood waters by pulling her up onto the empty industrial barrel he's riding and then leaping upwards with her from the barrel to grab an overhead trestle. With Ben's own weight making the floating barrel exceedingly top-heavy, it's impossible for him to do any of these things. He should be struggling in vain the entire time to get atop the barrel.
How a werewolf can reactivate a long-inactive volcano is not made clear.
Despite Ben growing to be 8 feet tall when fully transformed when as Ben wolf his clothes still stay on but should be torn when transformed.