Receiver's Partner Not Ready

Cindysphinx

G.O.A.T.
I was watching the Bryan brothers v. Spain in the Davis Cup. On a key point, the Bryans are serving. The receiver is standing there ready to receive.

The receiver's partner held up his hand to stop play before one of the Bryans served. The server did not see this and served the ball. The returner took a swing at it and missed IIRC.

The chair decided they must play a let because . . . I have no idea why. I mean, the general rule is if the receiver makes any effort to return the serve, the receiver is deemed ready. But what if the receiver's partner has held up his hand to signal his not being ready?

I can imagine this sort of thing could happen in unofficiated doubles play if, for instance, the receiver's partner sees a ball being blown onto the court but no other player sees it. The receiver's partner might hold up his hand, but his partner might attempt to return.

So how does the rule work in this case? Did the chair ump blow it in the Bryan brothers' match?
 

Swissv2

Hall of Fame
Doubles is a game in which a returned ball can easily be cut off for a point. The receiving team must be ready (All players must be ready) or the serve can be called a let.
 
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