User blog comment:Kogath/Monster Hunter X Discussion/@comment-6050823-20151218044840/@comment-5569775-20151221045607

Some animals will leave a carcass or an injured prey in it's territory as a trap of sorts, to lure in other animals/prey. I wouldn't put it past Oliver to do that, given that Cephalopods are rather intelligent and Cuttlefish are some of the smartest.

It's also possible that the Gaoren managed to escape from the graveyard but was too wounded to make it out of the AF and just collapsed and died. I don't believe Cephalopods are scavengers, so it might have decided to ignore it afterwards.