I found that the second round (first reset) for the achievement worked best for my guys. I think some torches are still in the air at that point... so burn through the first try as fast as you can, but keep going thru the 2nd timer if you miss the first. Odd side effect, on 4 of the 5 wow clients, the character's screen crashed when the achievement popped up. Had to log each one back in game after they got the achievement. Oh, and the torches aren't bop, so just hang onto 20 or so and pass them around til all 5 got the achievement. Was the last achievement last night I needed for 5x Flame Warden.