If anyone is interested in writing a Lovecraftian horror novel and getting all the details just right, I recommend this paper by Kier and Leeuwen. They used a high-speed camera to capture exactly how a squid, Loligo pealei, strikes and seizes its prey. Isn’t it beautiful?
In the first frame, you can see the animal poised with its arms and tentacles pointed like an explode at the target, a shrimp. Then, as the squid slides forward, the two tentacles race forward with impressive speed (these frames are 10msec apart; the whole sequence occurs in a bit more than a tenth of a second), and the eight surrounding arms peel back and form a lovely writhing flower of suction cups and waving hydrostatic grasping organs. Oh, this is such a splendidly baroque little carnivore.
Kier W, Leeuwen J (1997) A kinematic analysis of tentacle extension in the squid Loligo pealei. J. Exp. Biol. 200:41-53.