Stationary Elbow during screen

[The R]

BJV 2 man game last night. I'm lead opposite. Screen set near lane line extended and just below 3 pt arc.

A2 sets a screen. B1 runs into screen then falls backwards onto the floor with a grimace on his face.

I wasn't looking directly at the play but caught the end of it. It seems from my perspective that A2 had a high elbow during the screen. I assumed B1 ran into the elbow with the side of his head.


I didn't have a whistle on the play as I was not sure exactly what happened and would have been guessing.

Following the game my partner and I discuss and he said he thought B1 just tripped over a foot and never made it to the high elbow.


1. How would you have handled this from the info I've provided in my position?
2. Would this just be an illegal screen if the screen was set with an elbow extended but not moving?