Caanerin in Summerset. A fight with maybe 8 players, outside of the usual arena.
I arrived when she was at 44%.
During the fight I was once teleported into the arena, so ran out again.
When she was dead, I could loot her.
When I arrived back at the Justiciar though I realized, that the kill did not count for the daily quest, I think because she was killed outside the arena.
Oh maaaan... until now I thought some players were too quick for me to kill those bosses and I somehow did not get pulled into fight when I went afk for a moment (even though I stood really close)... this would make much more sense, since I was normally still alive when coming back to an empty scene.