Thats not big...
Ha! ...I was scuba diving off Baja in Mexico, and it is imperative to get out of the water if you see a humbolt (sp) squid.
A 1m-2m squid can drag a scubadiver down to his/her death and will eat you buy pulling plugs of your flesh out an acorn-sized piece at a time....and they get into a feeding frenzy just like sharks, but worse.
If A. Dux is encountered over 3-5m long, it could probably instantly kill you. They are extremely fast, violent, and powerful. They would only take out chunks about the size of a grapfruit.