How the octopus manage to eat the Penna with out get caught,Penna is a shell fish lick two hens,that open an c

how the octopus manage to eat the Penna with out get caught,Penna is a shell fish lick two hens,that open an close very fast and very tight if you pout you finger in it will be cut to a apices's,but the octopus manage to eat it this Cain of Shell fish with out be harm,remember octopus is very smart,the answer will amaze you,i will answer this Q.later