Orchid has her sparehand pass her a scroll of fireball, which she promptly read off.

Spoiler: OOC
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Free: Sparehand puts whatever it was carrying away and hands Orchid a scroll of fireball.
Standard: Activate the scroll of CL3 fireball: (1d20+20)[30]; target as many bats as possible. Fireball damage: (3d6)[15]