Citi Field Gets A Yellow Card

I noticed this after the top of the 9th inning. Clearly they’re directing..something, but what? Security guys on the field? Cameras? Something else?

photo by Ceetar

They also had a blue card and a red card. I’m sure it’s a standard Red/Yellow/Green-Stop/wait/Go type system, though I don’t know what the ¬†blue is for.

photo by Ceetar

 

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