Currently, only mesmer spear 2 crits procs the shark animations of Kamohoali’i Kotaki. Compare this to warriors, whose F1, 1, 2, 4, 5 spear crits cause the animation.
I understand mesmer 3, 4, 5 not causing the shark animation, but I believe that the basic attack (1) not causing the animation is a bug as it is basically a 3-chain melee attack similar to warriors.