Maybe I'm an idiot, but if someone has punched me in the face and is trying to knock me unconscious by slamming my head on the concrete, they're using deadly force on me. My common sense,especially during a beating while calling for help is use anything at my disposal to make the beating end, even if it involves deadly force.
Anyone who would disagree needs to have their nose broken and their head slammed against the concrete repeatedly until common sense allows them to think clearly.
fistfight deaths most by hitting head on concrete:
http://www.ocregister.com/articles/goodrich-308653-baird-victim.html
http://www.youtube.com/verify_age?next_url=/watch%3Fv%3DaLEBBJi-R9c
http://abcnews.go.com/US/video/fatal-fight-caught-on-tape-11445425
http://blog.cleveland.com/metro/2010/06/parma_man_dies_after_fighting.html
http://www.mlive.com/news/kalamazoo/index.ssf/2010/10/kalamazoo_public_safety_invest.html
coma after shoved into wall
http://www.snotr.com/video/2834/Cop_sends_innocent_guy_into_a_coma
brain injury no external evidence
http://www.encyclopedia.com/topic/Head_injuries.aspx