What color is the h2 pawn?

Only one of the following 2 positions is legal. Which one is which, and why?

@BigDoggProblem

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@ponderable said
@BigDoggProblem

[hidden]
The bishop is giving check to the King but can't have moved there in the last move, so it hato be a discovered check by the King move I fail to see what that has to do with the h-pawn 🙁.

[/hidden]

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@shallow-blue said
The king is in double check...

Thought 1: [hidden]Neither checking piece can have given the other a discovered check, not even if it were a promoted pawn.[/hidden]

Thought 2: [hidden]As shown, this position is impossible. I can't make it work by rotating the board, either.[/hidden]

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@bigdoggproblem said
Only one of the following 2 positions is legal. Which one is which, and why?

[fen]8/4r3/1kP4b/8/8/5Kp1/7P/1R4Bn b - - 0 1[/fen]

[fen]8/4r3/1kP4b/8/8/5Kp1/7p/1R4Bn b - - 0 1[/fen]

@ragwort said
I think the h2 pawn is Black because in the sequence:

[pgn]
[FEN "5b2/2p1r3/1k6/1P6/4p3/4K1p1/5P1p/1R4Bn b - - 0 1"]
1. ... Bh6 2. f4 exf3 3. Kxf3 c5 4. bxc6 [/pgn]

The white bishop could not access g1 if both f and h pawns were white.