I think we thought the runner was being put on 3rd because the dash seems to break up the obstruction and the base. If you left out the dash ("runner safe on obstruction at 3rd)" we might have gotten it quicker, though your sentence structure appears right. If you had meant the runner was being put safely at 3rd, you would have put together the "safe" part and the base part, something like, "runner safe on 3rd due to obstruction."
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Matt
Not an official,
just a full-time dad,
part-time coach,
here to learn.
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