Seeing an opportunity, Melisandre crosses her fingers as she whips up another bomb and throws it at the second fly, letting the doorway contain and channel the explosion away from her allies.
Spoiler: Mechanics
Move SW 2 spaces
Throw bomb at Fly 2:
Attack Roll vs Touch - (1d20+4)[15]
Damage - (1d6+5)[7]
Splash damage - 5, Reflex DC 14
On miss, scatter roll - (1d8)[6]