the only question is, if you were lying on the ground being pummeled by 5 year olds, couldn't you still take out like 25 just by kicking and punching away?
I have little doubt that 10+ 5 year olds could bum rush me and subdue me at least temporarily. The thing is though that they have to knock you out. If they managed to get me on the ground and I was in the fetal position, I really don't think their punches/kicks would be enough to make me lose consciousness. If you have ever boxed or wrestled seriously you know that an all out attack tires you out very quickly. I think I'd be able to withstand the initial onslaught and take those little shits down once they tired out.

You also have to consider that one solid punch or kick to the head of little Suzie or Billy is going to incompacitate them. You can maybe teach a kid to fight somewhat in 24 hours, but you can't teach them pain tolerance. Five year old's bones break much easier than mine and if someone is potentially trying to kill me you can bet your ass I'm still going to fight as well as I can even with broken ribs, arm, etc. If I had the chance I'd also try ripping the femur of a kid and start cracking skulls. All that said... I think I could realistically take 20-25 kindgergardners.