http://www.youtube.com/watch?v=U_5blaQLJWg
Must be a hollywood SFX movie. We were assured this does not happen.
Ol’ Jaques will be shocked to learn that Sharks have a natural resistance to killing their own kind. Like Lions.
Grossman was refering to our midbrain, hence to MAMMALIEN. Are sharks mammalien? No. So your point is moot.