So here is my legalistic response.
RULE 4, SECTION 18 FIGHTING
Fighting is a flagrant act and can occur when the ball is dead or live. Fighting includes, but is not limited to combative acts such as:
ART. 1 . . . An attempt to strike, punch or kick an opponent with a fist, hands, arms, legs or feet regardless of whether contact is made.
ART. 2 . . . An attempt to instigate a fight by committing an unsporting act toward an opponent that causes an opponent to retaliate by fighting.
And this leads to the old question about what to do if two teammates punch each other during the game. Is that fighting? Are they DQ'd?
Personally, I would toss them by pointing to certain words contained in the definitons of an unsporting foul in 4-19-14 and a flagrant foul in 4-19-4.
4-19-14: "dishonorable conduct"
4-19-4: "displays unacceptable conduct"