We do slightly differently. we kill Commander Jorland 2nd and Massey last. Massey is a melee so he can be kited pretty easily when he enrages. I will upload a video of our kill in a minute.
We didn't get the chest to open, not sure if because we didn't one shot the encounter or because we didn't kill Jorland last..
on normal mode back when we did this, we killed Jorland last (medic and massey first) but chest still bugged so I think you have to one shot the encounter to get loot.
Hopefully Jan 4's path will fix it..
Just did this encounter after the patch, we didn't one shot and the chest was still bugged.