User blog comment:JackFrost23/RDR Cheater Exploits and "The Bubble Gun"/@comment-121.213.167.118-20110621131735/@comment-1265875-20110621155600

Yeah, this is a different glitch altogether from the Rapid-Fire and Infinite Health exploits.

I can't remember what moniker this particular glitch was given, but it involves being able to get outside the map in the train tunnel north of Armadillo (at least, that used to be the way). Once outside the map you had to get o a certain spots and do a series of convoluted maneuvers on horseback without falling through the map.

Once accomplished, your character body would remain in the mountains while you could travel all over the map, invisible to other players, and kill them all you liked.

(Incidentally, I'm not telling you this from experience, even after getting to the specific location, I could never do the horse stuff right to make this glitch happen.)

This is why the kill-cam shows them in the mountains (probably rolling repeatedly, too) and why the distance the shot covered is impossible.

Some say R* have patched this exploit, and indeed, I now respawn in Hennigan's Stead somewhere when I attempt to get out of the map in the train tunnel. But that doesn't mean that another way to use it has not been found.