Dave,
ASA 4-7-C-2 a and b address this. The key would be intentionally interfering with the play. I kinda like the "animated" coaches who get into the game big time.
Having said that, straddling the base line could be viewed as intentional interference because that would block the BR's path and FORCE her to turn towards 2B, or stop. I think that would be a stretch.
What you reported seeing I would have no trouble with.
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