lets just say for a second that brain damage isn't caused by being punched in the head so much. how is the rule supposed to be enforced? Suppose for example someone has full mount on some poor sap and is raining in the blows, the ref is supposed to stop the guy with mount and give the other guy a chance to stand up? Now lets say he can still stand? now what? do they go back to the previous position they were in or do they restart standing? In this scenario both are stupid as you have just gave the mounted person a chance to find there wits and stratagize a way to get out of the bad position when they should have been finished off right there.
"When I lose, I get my butt kicked. When I win, I be doin' the butt kickin..." - Quinton Jackson