Stomatopods, or mantis shrimp, do produce a secondary cavitation bubble that hits the target a millisecond after the smashers arm hits the target. The hit can produce up to 200 pounds of force (the peacock mantis shrimp) and is among the fastest blow of any animal. They use it to open up shells and such, so that much concentrated force could break something, up to a point. The 2010 November issue of Coral magazine (available on ipad) was devoted to them and had some awesome pictures. If you were its size it would make the Predator look like a Barbie doll.