I can see what you're saying, but I also think Spock processes information quickly so when Uhura gave him the infromation that McCoy needed BC's char alive then I think it would've made more sense for Spock to knock him out with as little damage as possible instead of continuing to beat on him. I think he'd have compartmentalized his rage a bit quicker than he did. Hulk kinda doesn't do that, he's more you hurt Bruce, you hurt me and now I'm going to hurt you...It's kinda an Inigo Montoya you killed my father prepare to die but with less elegance thing.