Long story short, we spawned our servitor. The other team knew so they backed out and sent me the message above.
Played many many games after that one and no luck.
Edit:- I hope this doesn't happen to anyone else.
Update:- We just killed the boss and the quest dropped. I've almost stopped playing Gambit after what happened to me with these guys. Bungie really should look into this so it doesn't happen to anyone else.
Edit:- Alot of people are angry because I shared this. Believe me you wouldn't be so angry if this situation happened to you. If you ignore this, soon enough it will become a problem and people will talk about it in the forums. Also it might've happened to people who don't have access to b.net and in all seriousness ingame reporting does nothing.
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What they should do for this quest is up the chances of it spawning each round it doesn't show up. And when it does but you don't get the kill, the game'll keep track of how many times you go at it. If you don't kill it like the third or so time around, the Drifter will call you over and be like... "Hey there, Guardian. Saw ya throwin' down with that big ball of nasty in the arena a few times now. Never seen anything like it before, but I've got a bead on what calls it out. If ya want, I can draw it out just for you and your crew, cuz let's be honest here...we both want to see what that thing has in it. I'm bettin' it'd be worth the effort for both of us!"