The decision to wait was definitely the right choice. The Ogres are exiting the dungeon unimpeded, a half dozen at a time and being cut down as fast as they appear.
The system is simple, the Wrath Bringers have encircled the area where those exiting the dungeon can appear, and the Ranged damage cuts them down, leaving the tanks to only hold containment and throw the bodies in a pile outside the zone so they don't interfere with the next group's arrival.
If they don't remove the bodies, the dungeon will consider the area occupied and pick a random spot nearby to send the next wave of arrivals, which would be a disaster for them. No way could they get to them all quickly enough to prevent being surrounded and outnumbered.
