I'm not in it to kill something that isn't really out to kill me. If that had been the final intent that thing would have sliced itself in half. If it wants to pull back at the last second to avoid dying, I'm not going to fight that.

[Jules doesn't have any bones to pick with the sharks. While he certainly isn't bothered by killing - he did happen to get into major trouble with his wife right before getting dragged off her for going on a murder spree without keeping any contact with her - he doesn't make a habit out of hurting things that don't hurt him first.]