The group advances. walking along the narrow corridor, they hear noises besides their footsteps. Tense breathing. The creak of a drawn bowstring. An ambush. And they heard the heroes just as well.

Coming at the corner, Shauna sees the stairs down, and two tieflings taking cover behind the balustrade. They have crossbows ready.

Spoiler: OOC
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Attacks against the first PC to leave cover, readied for when she leaves cover
(1d20+4)[17], (1d8)[6]
(1d20+4)[13], (1d8)[2]