Hawkins played a good trick here, no doubt. But so far he had nothing to offer to hurt killer or win against him. Even if killer would have slaughtered kid indirectly, Hawkins would absolute open after that. Opening his hostage was the only way how Hawkins could survive this, otherwise killer would have slaughtered the last puppet and after that, he would have slaughtered Hawkins. Obviously was not even the monster scarecrow any kind of useful against killer.