Meet the new Order of the Good Death mascot, the noble dead squid. This freshly dead cephalapod dances the medieval danse macabre on its throne of despair as soy sauce rains from the heavens.
Or, if you are looking for a more scientific explanation…
“Because this squid was just killed, its muscle cells were still intact and operational.
Extra sodium (the salt) sends ions to the cell that trigger the cell to open up, creating a cascade of chemical activities that causes the cell to fire, so the muscle twitches. That’s why the camera person keeps pouring soy sauce on those tentacles.”