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After all, they initiated this mission a little after noon, and Astrid explicitly told them to do this during the night. While not impossible, I think is more likely that Astrid didn’t set them up. The Nein just made many attention-grabbing battle spell decisions during a time which they should have known the Sanatorium would be staffed heavier.
I don’t think Astrid set them up, otherwise there would’ve been people waiting for them. Could be, but could not be.