FED 2005 Case book, case 8.4.1K (play as in the OP). RULING: As soon as B2 starts to run to first, the umpire shall forcefully announce that B2 is out. The ball remains alive. It is the responsibility of the defense to know the conditions that warrant the necessity of a play being made.
imo: There's a difference between announcing the status of the ball / runner / etc. (not coaching) and telling either team waht to do with that information (throw the ball (or not), run (or not), etc. (this is coaching).
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