Player A steps on Player B

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Situation:

Your the L and you've just administered the 2nd of 2 ft's. After A1 shoots, B1 and A2 (on the low blocks) jockey for rebounding position. Noone is fouling, just blocking out. Shot goes in. B1 falls to the ground as he turns to run down court. A2 who is on the endline side of B1 turns, sees B1 on the ground and instead of jumping over him or stepping around him or trying to avoid contact...looks down at player B1 and steps on his "jewels."

At this point (4th quarter) A is losing the game by 15 after having a 10 point lead.

What would you call?

Please specify in your response whether you are discussing a NFHS or an NCAA ruling. I'd like to hear from both camps.

Thanks very much,

Jake