Stunning evidence of a Six Gill shark with a fatal bite on the back. This animal is over six feet long, with a terminal bite radius of 1 foot (est). Whatever took this animal on was considerably larger accomplishing a terrific wound in one single bite.
For the money we'll say it was another Haxanchus that did this. The bite tearing around the edges looks familiar.
Video Costa Teguise, Lanzarote in the Canary Islands: