Ive been messing around on Prototype (PS3) for a while now, and i just discovered that u can break the sound barrier for a lot of damage. First u need the top upgrades for jump and run, then get both air dashes. You also need the Bulletdive drop. After that, go to the highest building in the game (Empire State Building) and climb/jump up to the very top of the spire on top. Finally, super jump and double dash to go as high as possible, then go over a street and bulletdive drop. You will see Alex break the sound barrier a second b4 he hits the ground.