Lane Luper, the A-camera first assistant, informed producers in his resignation email that safety procedures were “fast and loose” when filming gunfights for the movie. The resignation email was obtained and reviewed by NBC News on Monday.

“So far there have been 2 accidental weapons discharges and 1 accidental SFX explosives that have gone off around the crew between takes… To be clear there are NO safety meetings these days,” Luper said in the email.

“There have been NO explanations as to what to expect for these shots. When anyone from production is asked we are usually met with the same answers about not having enough time to complete the day if we rehearse or that ‘this is a 21 day shoot.’”