Whew! Just makin' it up as you go, I see!
I thought I was going crazy trying to remember THAT one! LOL
I wonder what some folks here would do if they were in a similar position--with a suspect refusing to obey orders to "Stop," continuing to advance on the officer despite a shotgun being pointed at him, and coming within a threatening distance of the officer. Personally, I think I probably would have let loose with the shotgun. Instead, Compean tried to bump him back in the ditch--a perfectly reasonable action, IMO.
That some would try to characterize this (failed) action as being "clubbed with a shotgun butt" is beyond nonsense. To suggest that such a move is not a normal and reasonable defensive move is also ridiculous and just reinforces the Johnny Sutton misinformation campaign.