If you're doing it on ps4, I can help.
If you're shit at PvP like me then complete the milestone on Quickplay/competitive while Trials is active.
The hardcore group players are doing Trials so you don't get demolished by them.
Also, nightfall is kicking my arse this week. 2nd failure last night with a pug. You've really got to call targets or the yellow knights and wizards will run away and recharge faster than you can due to the annoying momentum modifier.
Knights are also surprisingly good at dodging cluster bombs from curtain call. Warfcliff seems a better option.
The glitch isn't great since it leaves you 2-manning a tough area. And the max time permitted kicks in pretty quickly. You probably lose 3 or 4 minutes due to lower DPS and deaths. Reviving is really hard when you're the target of literally every enemy.
IMO you need to call the glitcher back when you go round the corner and hit the 2-wizards 2-knights 1-ogre part. It's hard to DPS them with 2 guys when a wizard or ogre can lock you down with their insane psychic machine guns.
Or just learn the anomalies.
Edit: Guess not.