This is an interesting one

[Altor]

Originally Posted by bob jenkins

I'd use the "loose equipment which interferes with play" rule, the "god rule" and the CS&FP handbook to make it right. Probably leave BR at second (if F4 was catching the loose ball, he couldn't have been about to catch a throw from F6 to play on BR)

I'm not a baseball umpire. But isn't the "loose equipment" rule supposed to cover the equipment of the teams playing (as opposed to equipment of others in the area)?

When I first read the OP, I would have gone with "spectator interference." That way I'm forced to kill the play, and it allows me to nullify the interference in whatever way I see fit. In the end though, we have the same thing: runner on second.