The Referee signals when the umpire is to move to the ball and when to move off the ball. If you are watching on TV, you'll not be able to see what the R is doing. Gotta be at a game to see. I see this because I'm now a timer... and yep.. team-A better complete their substitution quick enought for team-B to react else that play clock is going to expire.
Haven't seen that yet this year.. but it's been close.
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