If the person knew he was a werewolf, why would he offer to guard Lawrence's father? He would surely know Lawrence would react to him and expose him. This leads me to believe he had no knowledge of what he was.
sharePossible, but it's also possible that he just wanted to take out the old man, who was on to the fact that the murderer was a werewolf.
shareThat's true. He might have thought that the man was so sick he would not have the strength to expose him, which he would have been wrong from what we viewers saw as when Hugh was able to get upset.
share