"Nowitzki shot two free throws left-handed immediately after the play. By taking the free throws -- Nowitzki made 1 of 2 -- he remained eligible to return to the game."
Houston Rockets forward Carl Landry breaks five teeth in collision - ESPN
Is there such a rule in HS or college? Me personally, if a player can't take the FTs because he is injured but can return later that would be fine. Maybe some 4th quarter restrictions.