Trivia: Most movie buffs probably know this, but the mighty Mr. Eastwood is allergic to horses.
Trivia: The movie is supposedly set in early summer (July 4th and thereabout) yet autumn leaves, and at one time a morning snowfall, are seen throughout the film. The movie was actually filmed in southern Alberta during September and October.
Answer: Not crazy, but maybe there's a bit of the Mandela Effect at play. There's no such line in any draft of the script, and it's not in any version of the film I've seen (including theatrical). In any case, Little Bill already knows that Munny is going to kill him, hence his line, "I'll see you in hell." If there was ever any doubt in his mind what was going to happen-as he lay there staring down the barrel of a shotgun, wielded by a man who'd just murdered a roomful of people-it's certainly gone by that point.
Will was pointing a Spencer at Bill, not a shotgun.