I try to attack an anchor if I see it active, but I have a less than 50% chance of being able to loot the mobs/boss even though I am there from the beginning until the end. I attack everything I can, and heal people.
The last one I fought at in Deshaan, i was there when we started until the end. My friend showed up part way through and was able to loot, I was not though. This is the 4th or 5th anchor in a row, directly after that I helped kill a rare at the skull and crossbones on the map and wasn't able to loot it either.
Is there some trick to being able to loot the mobs from things like these? It's pretty frustrating and not much since in bothering with them at this point.