Newly-released footage from the set of Alec Baldwin's movie, Rust, obtained exclusively by BBC. It shows Baldwin firing a prop gun on set and giving out safety instructions and directorial instructions just days before the fatal shooting of cinematographer Helena Hutchins. Watch this. One more.

One more. One more. Now wait a second. I'm going to shoot right. You want to go on the other side of the camera? I don't want to shoot toward you. Okay, I'm going to shoot close to you.

That's the image you remember right after the shooting and killing of Helena Hutchins. Walden could face new charges of involuntary manslaughter from a grand jury. The actor maintains he's innocent and that he never pulled that trigger. Steve Wolf is a weapon safety expert for films. He's a consultant for the prosecution of the criminal case and engaged as an expert witness on the civil suits. Steve, good to have you back here with us. I know that you have said that it would be impossible for the bullet to eject from that pistol without pulling the trigger. But let me just get your thoughts first on that video that we just saw. Can you take anything away from that, given what happened the next day?

Absolutely. What I could take away from that is that Alec did have an awareness of firearm safety, that he was aware that the blanks could be dangerous. He stated right there, I don't want to shoot this towards you. Could you move to the other side? So he knew gun safety. The thing is that gun safety are rules, not suggestions, which is to say you have to follow them all of the time. So the fact that he followed them on a Monday, but didn't follow them on a Tuesday, doesn't excuse that accidental killing.

So with regard to this case, which it looked like he was off the hook, but now there is this new case. Can you tell us anything about what you're learning from this part of the legal process?

Yeah, there's a lot of legal wranglings going on and back and forth between the prosecution and the attorneys. But ultimately it comes down to, if the gun is in your hand, you're responsible for what happens with it. If you don't know how to check it, you ask someone. The person should check it in front of you, show it to you, teach you how to do it. He's got the familiarity. He described on his ABC interview exactly what it looks like when you work with a proper armorer, how they check it, they open it, they hand it to you. If you mess with it, they take it from you. They scold you, they give it back to you. And none of that happened on this set because they had a very inexperienced armor. But ultimately, if the gun is in your hands and something bad happens, you have to take responsibility for that.

And he also said in that ABC interview that he didn't pull the trigger. Your thoughts on that? That would.

Be contrary to my opinion and that of the FBI. The reason that I think he could think that, though, is that because on these single-action guns, it's such a short trigger press to activate it. So if he was just holding his finger on the trigger, not aware that he had moved it that tiny bit, and then he pulled the hammer back and released it, the gun would fire without him being aware that he had directly pressed it because he thinks you have to press it after you cock it. But in fact, if you're holding the hammer back and pull the hammer back and release it, the gun is going to fire. There's no evidence that there was anything mechanically wrong with that gun that it performed exactly as it was supposed to.

And the gun that we see him using in the video that we just watched is a prop gun, right? But that's not- Well, no. Go ahead.

It's not an inner gun. It's a gun that's designed to fire blanks and potentially to fire live ammo. And we can't tell from that video whether that gun had a restrictor installed in it so that it could only fire blanks. But based on the fact that likely that same gun is the gun that killed Helena Hutchins, that gun was a real gun, and it had not been modified. And so we shouldn't say it was a prop gun. If it can shoot blanks or if it can shoot live ammo, it's a real gun.

So you believe that the next day it was a real gun that someone put real ammo in?

It's not just that I believe in it, it's a fact. There was live ammo in it. The ammo did come out. The gun was capable of firing the ammo. There's no reason to think that wasn't a real, regular, unmodified gun, and that's the guns that kill people. You could work backwards or forwards. In any case, it's not a prop gun. It's a real gun.

All right, we'll see what the outcome is of this case. Thank you, Steve. Good to have you back on the program. Thanks. And we will see how it all ends up.

Hey, everyone. I'm Emily Campano. Catch me and my co-host, Harris Falkner and Kaylee Mechaneti, on Outnumbered every weekday at 12:00 PM Eastern, or sets your DVR. Also, don't forget to subscribe to the Fox News YouTube page for daily highlights.