As a practical matter in this situation, you don't want to call the runner at first for leaving early unless it is very obvious. Being in the C position a good distance from the runner at first, you don't have a lot of credibility on that call.
Also, from an advantage/disadvantage perspective, the runner at third has a lot more to gain by getting an extra step or two toward home. It could be the difference between scoring or not on a suicide squeeze play or an infield grounder.
BU should be watching both runners, but more focus should be on the runner at third.
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