[Ref in PA]

If I was the trail, I would swing near the bench on my way up the court. I would do my best to see if the arm was broken from my distance. If I felt the arm had any chance of being broken, I would blow the whistle and stop play. No way am I going to let play go on if there is a chance of a broken bone. If not, I would urge the coach/player to get back on the court until there is a stop in play as I went by. The urging might include a phrase "It is a technical foul to leave the court during play."

Yes, you could call a technical - and be within the letter of the rules, but I feel that would be poor game management if that was done without any effort to get the player back on the court. If the evaluator wants to chew me out for stopping play, I am willing to take the heat in that case because I know I made the right decision.