Ok, I'll take a shot.
I'm siding with Warren here. The BR is out because the ball never touched anything other than a fielder. The rules don't say anything about a fielder becoming part of the field when he falls down, only that he becomes part of DBT when he falls down there. Since he's still in LBT, he's still a fielder (whether he's alive or not
) so I have a catch and putout by F8 with an assist to F9.