Dona finishes the stairs and sees Semult and Trawyn in the way. She moves past Trawyn to get into position to help against the tieflings.

Semult steps back out of reach of the tieflings then casts Grease into the midst of the tieflings which is accompanied by a slightly noxious cloud off to the side.

Spoiler: OOC
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Dona double moves to AF9 avoiding granting AoOs by using row 8.

Semult 5' step to AB8 then cast Grease at AD10/AE11 affecting T1, T2, T4, T5. Reflex DC 16 or fall. Lasts 3 rounds.
Cloudy Conjuration (CM p40): 5' radius centered on AE10/AF11 affecting T2, T3, T5. Sickened while in it (affects above saves for T2 and T5). Lasts 1 round.