I’ve noticed that when you finish some combos with the rapier salty makes a flashy move where he points the sword skyward and admires it’s beauty. During this animation it’s not possible to fire the pistol which can occasionally be pretty annoying (better to shoot rat in face than to admire your long schtick mid combat).
Light 1, 2, 3, brief pause, pistol. If you get the animation during the brief pause then it prevents the pistol shot.
Make pistol shot cancel animation.
Block before shooting cancels the animation.