I have this short story I'm working on where there's this creature that used to be a man but has lost his mind and become an animal and lives in freezing mountains and feasts on whatever warmth he can find--mainly from living animals he has just killed. He cannot bring himself to leave for warmer lands because that is where his wife died. He then kills a human, who he suddenly realises in a fit of remembrance is his son, come to find him and his wife. The problem is I don't know how to end it. Any suggestions?