How did I JUST realize this about Polymonstrum.

ITS A MANTIS SHRIMP. It looks just like it, only it's gray, light gray and black! No wonder they're so strong, they punch 40-50MPH! Why would it NOT be strong? Plus, it's 50-100x the size of a mantis shrimp, it SHOULD be stronger! This makes so much sense! I don't know why I didn't realize this before!