" 'Curly' enters, and the long-awaited conflict with 'Jud' is now unavoidable. 'Curly', his hand holding an imaginary pistol, fires at 'Jud' again and again, but 'Jud' keeps slowly advancing on him, immune to bullets."
BTW, for any who haven't seen the film version, if you like your Oklahoma! dark, the film's excellent ballet sequence gets pretty dark in its second half, including a depiction of this moment using a real (dream) gun.