We positioned the raid in the hallway south of the room and the pull team cleared hall roamers, and other misc mobs from the room until they were all cleared.
We moved to the doorway and hit the MT with HOT and runes and whatnot and he ran straight to the boss and engaged face on. Melee DPS ran around behind him and engaged. Caster dps engaged from the stair steps to his front. Healers and heal team positioned on the stairs just in front of the entry hall doorway thingie but within heal range for the fight teams.
As soon as the mob split into the two Brothers-in-Arms the raid leader shouted to leave the room. One or two of our melee dps were a little slow on the draw and got squished before they could run out. We all moved down the hall to our original pull spot just south of the room but not too far south to the previous (uncleared) room.
We had one tank pre-designated as hallway guard with orders to immediately engage any hall roamer mobs he saw in our raid area. All healers were told that whoever is nearest to him to cover his heals. He was already on one of the Pixt horse lady mobs when I got out of the room.
The two brother mobs were stompin around and got leashed back to the middle after we cleared out of the room. After things quieted down and we did the couple rez's we moved into the room on the left side near corner. The pull team started working on splitting the brothers and that took a few minutes.
Once we had one brother mob it was a straight up melee fight in the corner until he split into two smaller mobs again. We had predesignated a 2nd MT and melee dps and caster dps just engaged whichever mob was nearest. Both those went down fast.
We divvyed up the loot, rezed somebody who over nuked and pulled the 2nd Brother in Arms for a repeat performance all in that same near left corner.