It's 'cause Rev has them all (Destiny)

by someotherguy, Hertfordshire, England, Monday, May 18, 2015, 02:48 (3288 days ago) @ Xenos

Yeah, we couldn't get them to both Spawn at the same time, kill one group then catch the tail end of the other. We think it was because there's six of us - we'd have to get matched into an area with room for all of us, which more often than not was one with no one else in, so there was no ongoing event in progress.

The one time Speedracer stayed in the Citadel to keep an eye, they spawned normally, but he missed out on a chest. We should probably have taken it in turns to miss one, but we were coming to the end of our run by then and didn't really care.