Proper Mechanic R2 Advancing

[bob jenkins]

I agree with yawetag.

BU has the fly ball until PU calls him off. BU has the plays on the bases until PU calls him off.

In the OP, PU should call the BU off, unless PU's on the line (and PU should communicate that). Just like on "routine singles to left with R1", PU should make his way toward (no to) third, even when there's not much chance of the runner advancing to the base.