It looks like a combination of assassination rogues, fire mages, ele shamans and unholy dk's in the mix. Some fights are so fast it doesn't look like they bring a healer, and only bring 1 tank.
The basis looks like ring, lust on pull, pot, everything and boss dies before lust runs out. How did 3-5 minute fights go to thirty second fights in the same item levels?
What's going on here that I'm missing?
(Specifically Heroic HFC)