He carries other lives besides his own.

Come back!' 'What does this mean ?' cried the locksmith.
'No matter what it means, don't ask, don't speak, don't think about it.
He is not to be followed, checked, or stopped.

Come back!' The old man looked at her in wonder, as she writhed and clung about him; and, borne down by her passion, suffered her to drag him into the house.
It was not until she had chained and double-locked the door, fastened every bolt and bar with the heat and fury of a maniac, and drawn him back into the room, that she turned upon him, once again, that stony look of horror, and, sinking down into a chair, covered her face, and shuddered, as though the hand of death were on her..