Rosa saw the Brute walk in with it's weapon so close to Celaena's face she had to act fast to keep everyone in the room safe so she set the Brute on fire by envoking a fire spell that burned him as the brute was on fire he aimed his attack after her now as Rosa set him on fire, The brute could hardly see through the fire because it was so strong so Rosa took that advantage and unsheathed her dagger and slit that Brute's throat killing him instantly.