NFHS 8-6-18 "intent"

[Andy]

I'm having a hard time picturing how R1 ended up on top of F2.

If R1 slid into home and F2's legs, shouldn't F2 be on top of R1? If this is the case, F2 should be able to get up and retrieve the ball, and I don't see interference here.

You stated that R1 had "had rolled on top of" F2.....to me, this doesn't sound like something that would normally happen on a play like this. From your description, I think this action qualifies as interference. HTBT for sure, but there's my $0.02

As to where to place the other runner, I think that has been answered.