These octopi are already in agony from the lack of pressure, from the overcrowding. They have decentralised nervous system - one small brain (their esophagus goes through it, it's donut-shaped) and semi autonomous"brains"in their arms (arms, not tentacles). They are intelligent creatures. Their hotmonal system makes them die after laying eggs, their skin colour usually changes before natural death too. We have no reason to believe they don't feel pain. Just because they are unable to scream or run away (this is a deep sea creature after all - put yourself in similarly alien environment and think how able were you to escape with suddenly different conditions..) doesn't mean it's not torture. Because it absolutely is. If you choose to kill for the pleasure of eating a "better" meal, have the decency to make the death merciful - quick and as pain and fear-less as possible.
Asian cultures enjoy killing their food while in the process of making it - It gives one a sense of diabolical power over ones food... Or so I've been told
YOU FUCKING BASTARDS !!!!!!!!!!!!! what are you doing to these poor creatures !!!!!!!!!!! should anyone put you in icewater and afterwards on the Grill. YOU ARE NO HUMANS _ YOU ARE HEARTLESS MONSTERS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
For that last one he keeps it alive for all the butchering, and as a last thing cuts off the head. Couldnโt he have that earlier?? Or even leave in the icy cold for 30 seconds more, or something.