does anyone know how to get past the under the bridge part? it happens fairly early in the game. you get past the barracades, then meet with the woman, then you're under the bridge jumping from pipe to pipe. but you get to a part where there's really nowhere to jump except into the water. there's a big piece of canvas off to the right, which i thought might be important? does anyone know what to do here or is there a youtube video? i've searched youtube and google and i still can't find anything.