Mycah and Artanis stand just on the tunnel side of the doorway, out of the oil slick. Ash climbs to the ledge, and finds Mycah rushing to greet her. With a quick version of events, he catches her up to speed.

As the guard tosses his torch into the oil slick, it bursts into flame, creating a veil of flame from floor to waist height, though it begins to lower immediately.

Ash spies Artanis, back lit by flame, though the elf seems unharmed. Those below get Ash's call to join her. Artanis can feel the potentially damaging flames barring his way into the room, though they don't literally prevent his entry.

Spoiler
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Initiative tied. Declare PC actions and I'll sort it out. The guard in the room will bolt for the tunnel down which his fellows fled last time. He will reach the opening this round (if he lives to do so).