How would you handle this?

[Andy]

Hypothetical question on this situation:

Two umpires, no runners on base, number of outs are irrelevant to the issue.

Batter hits line drive in one of the outfield gaps. As she is running to second, she is obstructed by F4. BU signals the DDB. She continues to run to third, then home. Ball is retrieved by outfielder, thrown to the relay, then home for a bang-bang play on the runner. PU judges the runner out.

The question is the mechanics of ruling on this play. The obstruction and close play at home indicates that the runner will be awarded home.

Is it better for the PU to call the out, then have the BU immediately come in and award home due to the obstruction or should the PU have picked up the DDB signal at the time of the obstruction and simply called for a dead ball at the time of the tag at home?

Either way, you're going to have some 'splanin to do, Lucy!!