I have it recorded on Xbox, but won't post it here due to name-shaming.
I joined a game of Control, and this Level 8 used a Golden Gun within 30 seconds of the game starting. I killed him, then he spawned with ANOTHER one. This continued for the duration of the match.
This guy also went from Level 8 to 40 in a SINGLE match.
I reported him, but Bungie needs to address it.
Also, I'm not sure if this happens normally on Thieves' Den, but halfway through the match, the screen became dark and started shaking as if a Warsat was spawning.
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One thing to remember is that if you are close to leveling up the second you do hit a new level you get you super filled quickly. One time as a titan I walked into a match got one kill then Fist of Havok the other two players. I'm sure I got reported but it is what it is. My guess is that the player was one click away form a new level and the first points scored gave the co needed to level up.