Mahrez's penalty was controversy, I never witness something like this, even the commentator himself claimed that he didn't saw this call ever in his life. Mahrez penalty goal was canceled by the referee because he has two touches when he strike the penalty, one touch in his right foot and second touch in his left foot. Anyway, that penalty have cost them a point and another penalty missed from Mahrez or should I call it penalty fail.
^ Controversy? What? Who's the commentator? And what channel were you watching the game? I find NBC sports channel's commentators atrocious.
Anyway that was an obvious double touch and the right call by the ref. A player taking the PK may not touch the ball again unless it's touched by the opposing side's player.