Swinging elbows or not

[Damian]

A1 is receives a pass. B1 crowds A1 to the point that A1 needs to lean back with his feet spread apart to protect the ball. B1 crowds even further so that he is straddled over A1 leg. A1 attempts to stand upright and in doing so, his elbow hits B1 in the nose. The swing was not a deliberate act, but rather more a natural motion to get back upright. You could have...

Foul on A1
Foul on B1
No call.

At the time this happened, I had no call. My initial thought was that B1 was in the vertical space of A1 and could have been called for a foul. One of my partners was very upset that I didn't call an offensive foul on A1. I did have to stop the play to let B1 leave the floor.