The white guy in the shot is special needs. Retarded or whatever, his guardian/mother just didnt catch him fast enough before he kicked the kid. Then she was unable to tell the father that her son was 'slow' before he laid his a.ss out.
In hindsight its kind of a sad story. But you cant blame the black father, anyone would have that same reaction if you hit their kid, there was no way he could know that other guy was literally retarded.
musta been even harder to tell after he was laid out