It took a glitch whenever it shows in that trench there’s a boss there isn’t. It is a visual glitch and when it even know it’s marked there it does not mean someone killed it. It means there’s a someone killed it. It wouldn’t be marked on your map. I know this because my Fortnite genius and I play Fortnite a lot and I’ve encountered it before. Ok
And if you kill a player, that’s a boss you will not be able to come to the boss, but you won’t be able to get this suit like when you kill something that they had, including their mythic, legendary exotic whatever one they had ok