[spoiler]kek Wut? The cavitation bubble is an effect created by high pressure differentials, and is usually found in front of high velocity projectiles, it's not a force field. It creates high frequency vibrations and heat. Some shrimp in the ocean can create them by snapping their claws and use them as stun guns while hunting. You can't block sound. Especially not with metal, which would crack and warp. But whatever.[/spoiler] [i]I accept my defeat[/i] *walks off*