Dragons throat challenge

K so i took hench in challenge most of us died except for mo and rit whom i flaged away from badies then released to rez us. we were fighting when the timer was going to zero with 58 kills next thing i know rit drops ashes and were defeated wtf? tryed searching for this challenge but found nada any suggestions or comments on what i did wrong ty Brigit kildare E/MO (fire)

There's an npc there who explains it, or go guildwiki

It's a time mission, when the time runs out, it ends. Killing bosses, adds to the timer.

Well as this is my first challange maybe i didnt understand the whole concept.
what i got from npc and wiki was no way to win or not be defeated i will just get gold and xp
and its kinda like pvp . As im pve and doing GWs in order i was a little confused and want to get out of this part of game (so depressing).

Thanks Brigit Kildare

it's basically a time test. See how many enemies you can kill in the allotted time. When the time runs out, it's over.