Barelli: [explaining the terms of the duel] First they shoot at each with pistols, they have two shots each. Then, if they survive that barrage, they get to use their swords...
[turns to Leone]
Barelli: Why don't you just fire at each other with cannons and get it over with?
Leone Gala: The marquis is too good a fencer - but with a gun, perhaps...
Barelli: Have you ever seen him shoot? I have! He'll knock the wings off a butterfly at 50 paces!
[the conversation continues. Then, suddenly:]
Dr. Spiga: Excuse me, but where does this butterfly come in?