I had the same concerns (in particular I was worried about what would happen as soon as a mob of unstable flameragers hit my freeze trap), but I did it last night without much trouble, and there were a ton of people running around doing dailies.
Yeah, it's a pain with the flameragers running around. Worse yet on one try I was helping with a druid saw what was going on and stood on a rock while his flameragers ran in circles murdering everyone.
That said, he is rootsable and you can root him on a slow patch to speed things along. I've left my druid out there for now to help with that.
Sofia, the remarkably purple spirit cat as drawn by Ket Shi.