Sigh...

if it was not pre-meditated, and obviously there aren't witnesses that can say, try to subdue me (since I get a choice over what I do), I'll remove the teeth of the person, try to at the minimum remove the finger / toe prints of the person, and then stomp the skull / bash it beyond comprehension

If the option presents itself, the above, and fire, everywhere. The idea is to make evidence gathering impossible or a pain in the ass.