No, it doesn't.Shooting a guy in the back is the ultimate in cowardice. That was the whole point of the fight scene. Watts screamed at Andersen to "turn and face me!" to which Duke says "Go to hell…" Even Watts knew he'd gotten his ass kicked, and that he was being a gutless, back-shootin' turd blossom.

You'd be wrong too. Anderson ultimately winds up kicking Rustler's ass
by slamming him into a tree trunk. It's only then that Rustler takes a
gun from one of his gang and shoots Wil Anderson in the back…..cus
he's a no good coward!