Paul Farquhar
Legend
I don't think it would work that way. You would do the cancelling first, then only if it results in advantage would the shifter's ability be triggered.Yeah it cancels out advantage meaning if They have advantage and disadvantage it wouldn’t cancel each other out, but advantage would go away.
No advantage = shifter's ability is not triggered, so it can only ever turn advantage into normal, not normal (cancelled) into disadvantage.