This is likely to be hotfixed soon so if you're guilds in BT get it while it's hot!
If you are familiar with the fight, the boss (Shade of Akama) doesn't become attackable until after killing many waves of mobs and whatnot. We just downed him, and this is not currently the case. We noticed as the first wave spawned that Shade of Akama was immediately moving towards Akama. And became attackable much too soon. This lead to us being able to down him in 1 minute and 6 seconds.
In Short: If you can get to Akama, kill him now, and you can save a few minutes.
Maybe not considered an exploit as you don't need to do anything to activate this bug that I know of. (Hopefully 100% repeatable) But I'm just trying to give back a bit to the community as I've been long time reader with nothing to give as my own.