Legal move or pinning paradox?

Originally posted by Meadows
[fen]1bk5/1b1p4/1p4q1/6B1/2N5/r1Q3K1/8/8 w - - 0 1[/fen]

White gets to checkmate entirely using pinned pieces. Nice idea c guy1!

Nice, blacks last move must have been Bishop a7 b8+.

Could the Black c-pawn not have captured on b6 thus giving a
discovered check?

Nice example