[Have an expression of: That's nice, Castiel. :|

AKA, she doesn't seem very impressed. She's fought basically invincible things and has beaten them all.

She wordlessly takes the notebook back and gives the symbol a look-over.] Blood, huh? It's always gotta be blood.. [Buffy looks back at Cas.] So if you turn evil, if we can't stop you, I'll get my blood magic on and kick you out. Is that the deal?