I've shot a few refs, mostly be accident, but in one case this guy was in my line, and stepped INTO it while looking at the guy I was shooting! So I followed what I thought was good ettiquette.
I yelled "REF! MOVE!" Nothing. "REF!! MOVE!!" Nothing. So I put a ball between his legs just under Mr. Happy, which was my arc to nail the guy. Ref got the hint fast, I got my guy. All happy happy.
And I didn't need to shoot the ref! Just make it clear I would have...
-Tyger