I suspect that the plot of the real-life story is far more interesting than the plot of the movie being made. From Actor Arrested After Using Real Bullets:
An actor in an action scene apparently was handed a gun with real bullets rather than blanks, causing him to shoot and kill another actor, authorities said Thursday.
Actor Flavio Peniche — brother of internationally known soap-opera star Arturo Peniche — was arrested on suspicion of manslaughter and then released on bail of $40,000 on Wednesday, according to the attorney general’s office of Morelos state, just south of Mexico City.
The incident occurred on Saturday during filming of a low-budget movie, “The Scorpion’s Vengeance,” at a hotel in Cuernavaca.
According to a police report sent by fax to the Associated Press, the scene called for Peniche to shoot six people. After firing what were supposed to be two blanks, he realized that actor Antonio Velasco had been wounded and the crew ran for help.
Velasco died shortly afterward at a Cuernavaca hospital.
Police said they were still seeking the film’s producer, Eduardo Martinez Sanchez, and a props manager known only as “El Cepillo” — “The Brush” — who disappeared after the incident.