it could be alot of things... but I doubt she would yell at the cops that he doesn't have a gun.... while saying to her husband "don't do it" in relation to doing something with a gun. If that makes sense.
it would put the lives of the officers in danger, and I'm sure it would get her in trouble.
she was very calm when she first said he didn't have a gun..... "he doesn't have a gun" as in don't worry about that part.
imo, when she says Keith don't do it... it might be something about maybe that he gets excited when things around him are crazy (if he has mental health issues).
So Keith just comply, and get out of the car.... instead of don't get excited like you usually do when you are scared.
that's one small reason..but. like I said, it could've been other reasons... BUT back to the first point, I doubt she was trying to put the lives of the cops in danger...or her own by lying to the cops.
She is telling them he doesn't have a gun, while also telling her husband to comply and get out of the car. Think about that.