That's always a possibility when it comes to using "cursed" or "forbidden" powers without others really understanding why. DRK's "Fray" is more a case of Beneath the Mask, showing what the Warrior of Light is without his/her heroic front to hide certain ugly truths.

"Fray" even tells you after the battle that the people of Whitebrim (and those you interacted with during the questline) have seen what's beneath the mask verbatim.