Warlocks thought long and hard about the effectiveness of their slaps through the use of their space magic. It's of pure superior intellect that we bitch slap like pros. I've watched hunters throw their knives at shriekers and Crota... I assumed it was a mating ritual of sorts because it served no other purpose. Come to think of it, it was the same hunter every time. Kinky bastard must've had some bone and rotting flesh fetish and Crota wasn't responsive.