Init:
Melisandre
Flies
The rest party
Melisandre can interrupt their actions if he wants, the flies see fresh food and dart toward the entryway. Little bits of drool falling from their mouth orifaces, eyes wide and focused on the party (specifically Roze and Arakiel who are visible). Streaks of ice hit the ceiling in her panic from Roze at more bugs. Fly Two bites at Roze's arm to stop the cold, while Fly One bites at Arakiel's leg to prevent escape.
(Roze can attack again as I'll assume that was a surprise attack you posted)
Spoiler
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Fly one targets Arakiel, while fly 2 targets Roze.
Vs Arakiel
Attk1 - (1d20+2)[22] Dam1 - (1d6+1)[7] If bite, Roll Fort Save DC 14
vs Roze
Attk2 - (1d20+2)[3] Dam2 - (1d6+1)[3] if bite, Roll Fort Save DC 14
Map: https://docs.google.com/spreadsheets...WmQ/edit#gid=0