Hollywood firearms expert Bryan Carpenter says that actor Alec Baldwin broke the number one rule of firearm safety, which resulted in the tragic death of an on-set film crew member last week.

Carpenter, who heads Dark Thirty Film Services, told the New York Post that Baldwin broke the first rule of firearm safety.

“Loaded or unloaded, a weapon never gets pointed at another human being,” Carpenter said.

Carpenter — whose company specializes in firearms training, handling, on-set armory, and even firearm fabrication — said that when on a TV or movie set, “you never let the muzzle of a weapon cover something you don’t intend to destroy.”

Baldwin has said the firearm he discharged, killing 42-year-old cinematographer Halyna Hutchins, was declared “cold” to signify the firearm was safe to handle on set. That does not matter, Carpenter told the Post, because Baldwin “obviously pointed [the firearm] at another human being.”

“All guns are always loaded. Even if they are not, treat them as if they are,” Carpenter explained, citing what he told the Post are “Colonel Jeff Cooper’s four fundamentals” of firearm safety.