A lot of protocols were breached on the set of Rust when the firearm that Alec Baldwin was using “misfired.” A misfire is when the gun doesn’t go off, it’s an accidental discharge. Also, the very first rule on the set is, no live ammo. That rule was broken. Then, the cart with the weapons was not being attended fully at all times, also a huge problem. There’s several other missteps which is what led to the tragedy on the set.