Rather than the pincers employed by its more well-known crustacean cousins (the crabs and lobsters), the front appendages of ‘smasher’-type mantis shrimps are modified into clubs.
These clubs are formidable, high-speed weapons used for punching or smashing prey, as demonstrated by this peacock mantis shrimp (Odontodactylus scyllarus). Notice how its punch actually breaks the crab’s pincers in the 3rd and 4th clip.
The mantis shrimp’s punch moves so fast, that water at the point of impact vaporizes, forming small bubbles of gas in a process called ‘cavitation’.These cavitation bubbles implode, producing heat, light, and sound, and causing small shock-waves that further damage the shrimp’s target.
Therefore, the strike of the mantis shrimp is effectively a four-stage attack—the impact of the first punch, followed by the collapse of the first cavitation bubble, then the impact of the second punch, and the collapse of the second cavitation bubble.
If that does not qualify as a secret kung fu technique or finishing move or something, I don’t know what does.
video source: Kharn Stomatopods on Youtube
reference: Patek Lab, authors of this journal article.