[ Castiel nods - yes, explosive powder. He knows, he sniffed it. very unhappy molecules bouncing around in that there powder. ]

Ideally, we'd wait until everyone else is out, but I don't know how long these will hold. [ either their collective strength is waning or the tension on the vines seems to be growing as the minutes pass, they may not hold long enough for everyone. ]

Put it in place, and go, Ciri.

[ there's not a lot of time left, and Cas won't be responsible for her being left behind. ]