Some people here calling BS must not have tried to handle small children in an angry state. They can do a whole lot of damage.
1) the kid can swing away at full power as many times as he wants
2) the child is large enough to break ankles and knees(it only takes 6lbs of lateral pressure) IF he gets a lucky shot in.
3) kids are very lucky.
4) the race and weight of the man has no bearing on this as the man would be unable to properly fight back(and really race means nothing). A single full force punch would likely have ended the fight, and likely the child's life.
5) Adults have better self control.
"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." Thomas Jefferson