Guild Wars 2

I was killing the deadeye boss for the 5 gambit achievement when he suddenly disappeared entirely from the arena. A few seconds after I was teleported out of the arena and got tickets/achievements as if I had defeated him, even though I only had managed to hit him one or two times.
My friend who was with me experienced the same thing. We went to a different arena afterwards and didn’t experience the bug again.
We were in the norn arena when it happened, in case that’d be of any use.

EDIT: It seems like the quaggan from the “Crowd Favorite” gambit disappears a lot as well. I’ve spoken to some people from my guild and they’ve all experienced the quaggan randomly disappearing after taking damage.

Bukkebruse.2810:

I was killing the deadeye boss for the 5 gambit achievement when he suddenly disappeared entirely from the arena. A few seconds after I was teleported out of the arena and got tickets/achievements as if I had defeated him, even though I only had managed to hit him one or two times.
My friend who was with me experienced the same thing. We went to a different arena afterwards and didn’t experience the bug again.
We were in the norn arena when it happened, in case that’d be of any use.

Happened to me 3 times last time. I thought I was lagging and DeadEye somehow managed to stealth, or that I interrupted him and he nuked himself out from confusion (Perplexity rune).