Actually, it’s much better than my poor recollection:

“The figure in these two phases haunted the lawyer all night; and if at any time he dozed over, it was but to see it glide more stealthily through sleeping houses, or move the more swiftly and still the more swiftly, even to dizziness, through wider labyrinths of lamplighted city, and at every street corner crush a child and leave her screaming.”

Like a juggernaut trampling a child at each intersection and moving on. (Or something to that effect.)