During a valid parry, if Fencer Y scores a riposte but strikes X's mask with the bell guard, what is the referee's ruling?

In the scenario where Fencer Y scores a riposte but inadvertently strikes Fencer X's mask with the bell guard during a valid parry, the referee must consider the rules regarding safety and valid targets in fencing.

Striking the mask with the bell guard can be classified as an accidental, yet dangerous action that compromises safety, triggering a foul. As a result, the correct ruling is to annul the touch, indicating that Fencer Y’s scoring action is nullified due to this contact. Furthermore, safety infractions of this nature may warrant further disciplinary action, which, in this case, is represented by the issuance of a RED CARD to Fencer Y. This penalty serves as a deterrent for unsafe practices in the sport and underscores the importance of maintaining a safe environment during competition.

The focus on the annulment of the touch alongside the issuance of a penalty reinforces the notion that all actions in fencing need to comply with safety standards, emphasizing the sport's commitment to fair play and the well-being of its participants.