WoWDB

This achievement is completed during Desperate Measures, cast by He Softfoot (the rogue).  During this time, he will cast Mark of Anguish on a raid member and your goal is to pass it around the raid, covering enough distance and unique people to meet the criteria.

There are several different ways to complete this achievement.  You can form an actual ring or a chain around the room, or you can just make sure everyone spaces out as best as they can, and then each person try to pass to to the person furthest away from them (such as melee to ranged, back to melee, etc).  The range on passing is 40 yards so unless everyone is exactly 40 yards apart, it may take more than five passes to complete.  You may want members who have already taken the Mark to stand in the middle of the room so people know not to pass to them, and  stick to passing to the people at the edge of the room.

Note that there is a five second cooldown on the passing ability that will slow its movement through the raid.