Did the second Ascended Challenge with two friends last night. Took us some time to get what we needed to do, but in the end we killed all the knights. Right after the final blow I also got hit and died slightly after we defeated the last knight. I spawned outside of the portal, but the portal wasn't there anymore even though the tincture of queensfoil buff was still up. Even more, my friends got the challenge quest completed but mine wasn't. No challenge completed, and no access to the treasure chest. Another friend wanted to do it, and we even made him join the party after the tinctures stopped working and used another one. Still no portal that showed up. (Other secrets near the portal destination did show up.) Feel kind of screwed out of 2 tintures of queensfoil and the rewards for this quest. I get why the portal must close after it's beaten, as to not swap new people in to get access to the chest. But the spawn location after dying is just silly when it screws you out of completing the quest. Hope this can easily be fixed as to not have anymore anti-climaxes to such cool instances.