Killed 2 with less than 2 full groups. Max hit on me, 66 warrior, was around 442 or so. They are situated around a ravine where the Slumbering Beast is. Can single pull however no loot from the 2 we killed.
Typically these spawn (four of them) around the War Caller Kaavi (for the Enchanter Epic 1.5). They do not spawn until she is actually pulled or agroed. She is usually chasing the puller and when the four spawn, 2 are in her agro range and two are not. The two in agro range chase the puller to the raid. They are mezzable, slowable and cripple will land. So I imagine the two that you found were left overs from an earlier raid. And no loot for us either last night, but did get Enchanter epic item (4th piece of staff) from War Caller Kaavi. No extra loot from her either.