Have had a few 1v1 tournaments on shadowlands. Pretty impressed by the organization of this latest one.
Obviously, those who can drop out of combat have a big advantage. So there's an extra bonus for the non-stealther that makes it the farthest.
When you drop out of combat, the other person can out of combat heal as well. If the person you're fighting isn't an idiot, there is no big benefit to stealthing for a long period of time