All at once, I saw two figures: one a little man who was stumping along eastward at a good walk, and the other a girl of maybe eight or ten who was running as hard as she was able down a cross street. Well, sir, the two ran into one another naturally enough at the corner; and then came the horrible part of the thing; for the man trampled calmly over the child’s body and left her screaming on the ground. –The Strange Case of Dr. Jekyll and Mr. Hyde,
Robert Louis Stevenson

How does this passage develop the plot?