When to call catcher's interferance?

[mbyron]

Evans also teaches that it's not an umpire's job to tell the coach when he has an option.

On catcher's interference/obstruction, the correct mechanic is to (a) wait until the play ends; if the BR and each runner reaches his advance base, then ignore the CI/CO, and (b) if not, then enforce the award, unless the coach asks to take the play.

Do not ask the coach what he wants.