In a nutshell it is:
1. You can only use 6 heroes. The last slot is for a moderator that suicides immediately after entering the mission. He monitors your progress.
2. Clear Tahnnakai Temple HM as fast as possible.
3. No consumables of any kind.
I did multiple practice runs trying many different things out before winding up with this:
It's been several months since the contest, so my memory of it is less than clear, but I remember I learned a lot from it, and developed specific aggro techniques for each mob. Random factors were really annoying, depending on how a mob aggro'ed it could be cleared really fast or relatively slowly. I remember trying 2x Mesmers vs. 2x Eles before deciding (for some reason I don't remember) that the Eles were faster. Mantra of Flame was a relatively late addition after the Temple Guardians wiped my party a few too many times for comfort, while the Res Sigs took the place of hard resses because of the constant morale boosts.
I remember trying to squeeze as much power as possible out of all the bars, but they all stayed rather static. In fact the entire teambuild stayed rather static. The builds in the screenshot are instantly recognizable as a variant of the 7H bars I usually run, minus the second healer (compensated for in this case by Mhenlo). If there is something better out there, I didn't find it. Finally I also remember that 10:12 is a very fast time, my practice runs were in the range 10:45 - 11:15.
Just sharing the build for anyone that might want to see it, if you were 2nd or 3rd in the contest I'd be interested in seeing what you used as well
