http://www.dailymail.co.uk/news/article-1039758/Caught-CCTV-The-moment-drunken-gang-kicked-man-unconscious-girl-rifled-pockets.html
The video at the above link is a horrific CCTV capture of a gang jumping a man with a blow to the back of the head. They kick him on the ground and the most disturbing part is at the end, while the girls rob his pockets one of the lads casually kicks and lifts his head with his foot as it falls lifelessly to the floor. I think a recreation of something along the lines of this would have the impact I'm looking for in illustrating the fight scene