This is an interesting one

[Rufus]

NFHS rules (though I don't know if the rule set makes a difference). R1, no outs, when the BR hits a line drive to RF. RF comes up throwing to 3B and R1 is retired in a quick rundown (5-6 if you need to know). The BR has taken the rundown as an opportunity to try and advance to 2B.

The second baseman is covering the bag expecting this when a ball from an adjacent field lands in the infield and, in one bounce, goes right to the second baseman who tags out the BR who is sliding into 2B.

Please help me understand how you would begin to untangle this mess and what your call, with references, would be. I'll admit ignorance of where to even start looking in the rule book for how to treat this situation (other than knowing that the BR is not out for being tagged by a ball from a different game!).

Your reward will be to hear the post-script (enticing, no?).