He hopped planets at lightspeed, always afraid the children would catch up someday.
An additional, extra-story note:
This one, as presented, is an interesting study in how associated media affect the meaning of a story. The image of a child with a gun lends a sinister note. It would be quite a bit different — maybe better! — if the image was, say, a child holding a basket of flowers. Think of that image, a child holding a basket of flowers. What feelings does the story produce now?