Using the "n" word

[WeekendRef]

I was working a Varsity Fall League last week when I had a situation arise during the game that I really didn't think was a situation until I was thinking about it on my drive home .
Player A1 makes a strong move to the hoop and throws it down on Player B . Both Teams come back down the court and Player B1 starts to post up Player A1 and he starts calling for the ball saying he has a mismatch . There is some low chatter among the two and then I clearly hear A1 say "you gotta learn to move your feet nigg&%" . The ball moves around a shot is put up and I hear no more the rest of the game from either one .
I have a couple of questions :
DO I give a flagrant for use of the word nigg%& ?
If you think a flagrant should be called :
Does it matter if both players involved are black ?
How about if both are white ?
One white/one black ?

For the record everyone in the gym was black and I did not give out any T's . As I said earlier I didn't even think twice about it (as far as being a flagrant) until I was driving home .