So.. last night I was playing the weekly heroic strike playlist and ended up doing the Saber Strike where you have to have take down the giant shank. Well about 1/3 of the way though the mission a guy in my fireteam activates some sort of effect (which peaked my interest so I followed him) then he goes and stands in an area where it looks like he is pulsing with Arc energy (about halfway through the strike) when it stops he goes to a different area and the pulsing arc energy starts up again (2/3 through strike) except this time when it stops he obtains a tomb husk out of thin air. Then he goes and stands in a corner (2/3 way through strike) with the tomb husk and the Arc pulsing happened again, except this time it when it stopped it killed the guy holding it and transported him to some sort of area further in the map. I don't really know if it is some kind of secret related to the Sleeper Stimulant or one of many puzzles leading up to it. But I sent the guy a friend request and I plan on talking with him about it. This is a really good clue for the exotic hunters. There are a few things I'm patchy on. Like I don't know what the guy activated in the first place to get those arc pulses to appear in certain areas, I was also in a different area so he may have already found one of the pulsing arc energy places to stand before I could watch what he was doing. That means there could be a fourth place for arc pulses before the first one I have listed. I really hope this helps, what he did doesn't make sense to me but I plan on talking with him later about this. I will hopefully repost with more information later, I also hope this helps because it boggles my mind and I want to get to the bottom of this just like everyone else.