My group killed 2 Hunters (Revenant & Midas) at the location in this video: https://youtu.be/5gL3Wiemhuo?t=40
"Midas" died in an area where you couldn't collect the mask as seen here: https://i.imgur.com/LZUbSqs.jpg

When something like this happens, Massive needs to make it so the loot drops at the feet of the players so they can collect it.

This is my current mask collection https://i.imgur.com/ifJ6M5W.jpg