Sir Brennen
Legend
See, actually using the word "cover" in the ability description would steer readers to this logic alot quicker. I see what you're saying that the Lightfoot have a special ability to hide when they only have half cover granted by a larger creature, where normally you'd have to have total cover (be unseen.)Now here's the interesting part. Because the creature you're hiding behind only grants you half cover, you can still see it, even after you've hidden. So you don't have to "pop-out" of cover to attack (popping out would only apply to total cover, as you can see the target with any less cover). Of course the target would also have half cover. So when you hide behind the fighter, you're in an awesome position where you can see the target, but it can't see you. It's exactly the same as if you were invisible and repeatedly attacked from the same position. (Hiding and being invisible are two different ways to gain advantage from being unseen. If your target can't see you, you get advantage, even if it knows where you are)
I'm not necessarily worried about how to defeat the tactic. I'm not decrying the ability as overpowered or broken. I'm just trying to get it to make sense in my head. As others pointed out, if the fighter buddy is actually in melee with the target, you have advantage anyway, hidden or not.Again, it's trivially easy to defeat this tactic. Simply moving around the fighter to a position adjacent to the halfling prevents him from hiding again until he moves, provoking an opportunity attack.
The Hide action isn't tied to the movement, but a Stealth roll can be. It's the "and unheard" part (fka "Move Silently") of being hidden. Plenty of examples in the rules, such as using Stealth in exploration, or the Supreme Sneak ability of a rogue. Assuming you successfully used the Hide action behind the tree first, as long as you keep the tree between yourself and the orc as total cover, you continue to fulfill the "unseen" qualifier. But if you move, you risk breaking the "and unheard" part. So I'd call for a Stealth roll to *remain* hidden.Ah, but you can't make a stealth roll to back away from the tree. In order to move unobserved you must first take the hide action. The stealth roll is tied to the hide action, and NOT the movement.