not sure if this is a repost, as I didnt find anything.
Now this is Extreamly Situational, as first you have to have Kalecgos Dead, and second, it does not work for everyone.
We where trying to Get Brut down one night and during a wipe one of our pally's ran to the fire on the northeast part of the room (see picture, drew it myself :3 paint FTW) the pally ran directly through the fire, as if there was nothing there.
http://img443.imageshack.us/img443/7963/brutxv9.jpg (I will be posting a better picture tonight, when I get someone to run through there)
Once a Rezzer, or a Warlock with summoners get to the other side either start summoning or have a warlock die at the near the top of the stairs that can be rezzed (have the rezzer try to heal the warlock before the warlock kills himself)
Once you get all of your raid up to the top you run up and past twins room (as they and their trash dont spawn till after you kill felmyst) you will start to see the first pull of muru trash (like 6 imps) there are only like 15 - 20 pulls of trash between Twins and muru, as once you get into the room where you can see into kilJaedon's room there is another fire wall, which none of us could get past. The respawn timers are like 2 hours(not sure) but you can do this between brut attempts to try for trash drops or just to lighten up a Wipefest on the 2.4 Patchwerk ( as the trash is easy).
You can Also use this bug to reset Brut, if it is a wipe have someone run through the fire and when he gets to them on agro he dissapears and respawns. saves on some repair bills.