Monster description for the yeti: "A huge lumbering humanoid covered in icy white fur stares at you with bestial eyes. It's breath is visible and you can read the rancid stink of long rotten flesh. Its square face and huge forehead belies a primitive intelligence, almost more than the huge curved claws springing from muscular forearms. It lumbers forward with an apish gait, flexing its powerful muscles."

It seems that either yetis should be affected by humanoid slaying (I don't have such ammo to check but I assume it would also not affect them) or the word "humanoid" should be removed from their description.