[greymule]

I read the original post 10 times before I realized that this:

"who is close enough to R1 to tag him while he's still standing on the bag"

means this:

"who tags R1 while R1 is standing on 2B"

I initially read the former to mean that F6 was close enough to R1 to tag him but for some reason did not apply the tag, and I was wondering why that fact was relevant beyond simply depicting the play.

I see the same two outs that everybody has cited. I know that U-trip has had some "outlier" rules, like awarding only 2B to a runner who is returning to 1B when the ball is thrown into DBT, but I can't imagine that a forced runner enjoys some sort of immunity from a tag until he leaves his original base.