The Raven Prince AU – A Son of Fair Blood.
Since he turned into a raven to show Snow the nail she could use to defend herself against his uncle, he had been checking on her. He wanted her to escape and even if he really didn’t trust the Huntsman - at least not yet - he had to admit the man was doing a fine job in keeping his stepsister safe.
His mother was very angry when she caught him looking into the mirror, and drained his power as punishment. It wasn’t the first time she did this; his mother more than once had used him to backup her powers. He knew he was going to recover, it was painful nonetheless and he hated being isolated in the tower, where his mother doubled the spells to keep him locked.
Still, he was able to see Snow and the Huntsman, they were safe and that gave him hope. With time he was going to be fine and he was going to keep on helping them, no matter what the Queen said.