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3 man mechanics, runner on 2nd only, umpires are counter rotated, i.e. 3BU in D and 1BU in B. On a fly, if 1BU goes out, 3BU would come into the infield and watch R1's tag-up at 2nd base. If ball is caught, 3BU follows R1 to 3rd, with PU waiting at home for a play there. If ball is not caught, 3BU would 'release' R1 to PU who would have the call at third and 3BU would then have BU.
Of course if 3BU went out, then 1BU would have the base duties.
That's my understanding.
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