So last night I was working on some bounties and left from the Mothyards just looking around for easy kills for it. Anyway I head over to Rocketyard and found such a place, pretty much the second mob fight you see when heading out from Mothyards. After some time of waiting for my super then using it on each group, some time around 11:30 ish - 11:50 pm EST the normal mobs (Hive: Knight and 3 Acolytes; Fallen had their Vandal and 3 dregs) were joined by 6 thrall, a wizard, a handful more acolytes, and a knight, all of which where ultra versions. The Fallen were reinforced to match with ultras for dregs, vandals, and captains. So they are fighting each other and I am fighting them and each time one force got killed a new wave followed almost instantly. I had the event timer open on my laptop and didn't see anything happening in the area, and normally its just a kill the boss sort of event there anyway. Has anyone else had this happen? Was it just a glitch or something? Whatever it was it was fun and I would love to know more about it if you have any information on it.