BASED on the brief conversation he heard, Luo Yan could safely assume two things; One, the four teamed-up to clear this round and their team was obviously centered around the Angel. This was probably because he was a Priest. That class could do wonders for a battle royale. Two, they somehow found Dragnar and then, for some reason or the other, managed to reveal the other's location to other players.
Dragnar, being a huge threat to everyone, was like a big walking target. It wouldn't really be that big of a surprise if other players decided to team up to get rid of him as early as possible. No wonder Luo Yan saw that cluster of red dots on the map. That's probably the place where those players cornered the golden dragon.
Although if one thought about it carefully, it's hard to tell who were the ones being cornered.
