There are always going to be holes in the coverage of any two-man crew. As you said, your first priority is the fair/foul call. The next question I have was who fielded the ball and was the throw to 1st coming from behind the runner? If it was, then you were right to be watching for a running lane violation. If the ball was in front of the BR and it was a foot race to 1st, then you could have diverted your attention to the runner going into 3rd.
However, all in all, I think you handled the play correctly and gave the coach a valid explanation of the situation.
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