I cannot believe we played this correctly, so please tell me if this is right.

OL Turn 1 -

Dash on Splig, who moves, opens the door (action 1), moves, closes the door (action 2) and moves one more space.

Heroes Turn 1 -

Tomble moves (action 1), uses a fatigue to activate Lurk to search on the way (no action), moves again (action 2) and exhausts Sneaky to perform an open door action, nailing the Awareness test on the first roll. Door is open.

Ashrian performs prayer of healing on herself and Widow Tarha getting extra yellow attack dice for both; moves (action 1), takes two fatigue to move adjacent to Splig, and attacks with Grinding Axe and Mana Weave, 14 damage - 4 defense = 10 damage result.

Widow Tarha moves (action 1), takes two fatigue to move closer, attacks with Lightning Strike (action 2) getting two surges and 4 damage for a total of 8 damage - 1 defense = 7 damage to Splig.

Splig is dead, end of encounter one.

That was way too easy, please tell me we messed up....

Make sure to consult the Errata before going through any quest. The original form of this quest is imbalanced. The errata places Splig on the other side of the door, which gives him time to get away before the heroes turn him into a squishy paste.

...please tell me we messed up...

You messed up.

Gee.... I wonder why they changed it....