I haven't read all the posts on this topic so this may have been mentioned already but.....
I think this comes down to a matter of conditioning. There's no way even a full gym of 5 year olds is going to knock out an adult until he gets tired. How many of them can you knock out before you get tired? You can't puch all day. It would be like the Ali/Foreman fight. Ali just let George pound the [censored] out of him until he was too tired to even stand. I think the most effective tactic to use against them would be grabbing the back of their heads and yanking it down violently into your rising knee-cap.