Upstairs there's a trash pull with a large void elemental on either side that will increase it's mana to 100% and then deal a large aoe. On heroic my friends have been crying about wiping there over and over because of their terrible, terrible damage. Well, if you pull it and allow the elemental to reach 100% and then reset combat, they won't use any abilities and both pulls will be very easy.
Please do NOT rep me for this, just wanted to share this as it can help out people who don't have a lot of guildies/friends playing and need to do pub runs. I don't think it's all to helpful since it's unlikely that you'll wipe to the large aoe or these trash pulls unless your group sucks, and if your group sucks you probably wouldn't make it past the brann event anyway.