So, Played Archive of Arrizon last night, Encounter 1.
The quest rules state that "heroes (and the boulder) may move through the locked door". So first turn, 3 heroes moved out and attacked the Hybrid Sentinels in the first room, managing to kill one minion. On my turn, used "Shifting Earth" to move one hero back behind the door, and the other two closer to the Sentinels, moved the master 2 spaces in (fire breath, flurry, fire breath), killing the two heroes outside, then finished the move to place both Hybrids on the other side of the door.
As near as we can tell, this completely locked the remaining 2 heroes into the starting room, since the quest rules state that they can move through, but can not attack through the locked door.
Heroes elected to just stay dead (I had the Ettin, and the Medusase group in range if they stood up), and we just sped up the next 7 rounds until I won.
So, First round Victory? or did I cheat somehow?