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As I understand it, that means that a player who doesn't have an enemy non-pawn in the prison and has his king on his home rank diagonally in front of an enemy pawn (e.g. White king on e1 and black pawn on d2 - according to the rules not check because the pawn cannot promote and thus cannot move to its back rank or give check there) cannot then capture an enemy non-pawn because the enemy pawn would then be able to move to the last rank and thus capture the king - i.e. capturing an enemy non-pawn in such a case amounts to moving into check.