When Belle started the wind, Winston thought it was just a childish trick that would go away as not every reaper had such ability. Actually, no reaper had such ability and the one reason this reaper in front of him was able to make use of it was that she had his bone! It was his bone and he wanted it back. But the truth was, he couldn't get to make use of it if the reaper didn't return it to him as a gift.
Only the person who was gifted with the bone could make use of it. Condition had been kept, when he created it but who knew that he would lose it! It had been years and he had been looking for it.
