Assessing the situation like a true warrior of the wild, Stephan observed the witch as she enflamed her hands and blazed her surroundings creating a barrier around her. He noticed, first of all, that whatever she did, she controlled her fire perfectly; it wasn't eating away any wood around her, it was gently moving till it became rough around his body. It was always a good sign finding a witch in the Plaguelands with great control abilities and a gentle heart. Because she didn't seem to want to hurt him.
Next, after slowly moving to the side letting her come out from the house while keeping his distance, his retinas were bombarded with a ranged fire spell, it was weak but it made him close his eyes immediately and lift his dagger in the air while focusing on his hearing. There was someone else apart from the knights and it was a reckless move to let down his guard. His mission wouldn't succeed if the witch got away.