When performing the first scalp cut in the vor it is essential that the opponent believes that you actually intend to perform a beat. Your opponent, not you, is the one who actually performs the disengage to the outside.
When done correctly, this offers an easy cut to the arm followed by a thrust to the face or chest.
When done incorrectly, that is to say without the opponent’s participation, the cut to the arm will still be successful. Unfortunately so will the opponent’s cut to the same arm.