So...is the term "extended arm bar" unclear?

[Raymond]

Originally Posted by Eastshire

Fair enough. Personally, I've never seen someone use the same signal for both.

I've seen plenty of officials who just walk around with their hand in the air when bringing in subs, not pointed in any general direction.

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[UNIgiantslayers]

I don't think I've ever had an issue with this situation. The guys on my crew are pretty good at eye contact and a nod or a point if they're ready. Usually if they're calling a sub in, waiting for a tied shoe, etc. they are looking in that direction. I can't think of many cases where I put the ball in play without eye contact and a nod.