Blake, in an attempt to kill Daniel, throws a knife at him. Cromwell, however, steps in front of Daniel just as the knife is thrown and it sinks deep into the center of his back. In the next scene Cromwell is nearly recovered and is wearing a cloth sling to support his left arm. The knife wound to the center of his back would have in no way affected his left arm. In addition a sling to support his arm would have done nothing to aid the healing of a life threatening knife wound to the back.