[Jetcar]

I actually can say from having run Judo classes for 5-8 year olds, that an infinite number would be unrealistic. Classes ranged from 18-25 participants, and the warm-up would be for them to come at me all at once, and I would dispatch them as I saw fit. Our rules were different, obviously, the students had to practice their break falls and rolls once I sent them flying, and our area was about a quarter of the size of a basketball gym. I would say around 45-60 would be a realistic number, given the space (quite large in a gym) and the fitness level of the person delivering the knockouts. In my case, while doing the warm ups with the classes, I often projected the kids into other oncoming students as a measure of self defense. It would be pretty easy to do similarly as this thread suggests. You wouldn't necessarily have to knock them all out on the first shot, but just buy some time.