Shit shit shit shit--she takes a half-conscious step backward, even as she tries to reassure herself that she knows what she's doing. Because even as her fingers trace the shape of the spell, weave it like cloth, she doesn't have enough time. She's underestimated Rosa's speed, but if she moves out of the way she'll lose the spell.

Well, hopefully Rosa won't be able to kill her before she can finish the spell, anyway. It feels like winter in the sitting room. Air to water, water to ice...