http://ghostrelationsdept.blogspot.c..._archive.html). Since then there have been a couple of confirmations about this posted on the DB messageboards. The most significant is this one from wdwcaretaker:
http://p080.ezboard.com/Guys-with-th...cID=6630.topicLet me confirm. They are both ghosts who were once people who eventually died. Only one dueler in the attraction dies. As you face them from your Pod, the one on the right is killed by the one on the left. If you all had the opportunity to attend the repair of said ghosts, that fact could be easily proven. The one on the right tilts his head to the side when he is shot. This movement cannot be observed from where you are, but it is there. Take my word for it.
wdwcaretaker is a long-time WDW employee and maintenance guy at the HM, a rock-solid source for this kind of thing.
It seems that the Imagineers put a move into this AA that turned out to be virtually undetectable by riders. I'm sure they didn't plan it to be that way, since that's a lot of extra work for nothing more than an inside joke. Just one of those things.