I found this article today on this guy, "Slingshot Channel Guy", who has made a crossbow revolver out of ordinary (mostly) items. Here is the link to the article and the video. http://www.theblaze.com/stories/we-know-you-want-to-see-the-crossbow-revolver-that-lets-you-shoot-4-arrows-without-reloading/
Amazing! I guess this would work out pretty well for 2nd shots... and 3rd shots... and even a 4th shot... if the animal would still even be around... and if it was considered a legal hunting instrument. If the world does go totally wrong this guy just might make it?!?!