AC: and then he's, he's coming back at me and he's still got the bat and I'm like 'what are you doing?'
O: And where are you at?
AC: we're in the living room, and then I turned around and he hit me in the back of the head with the bat. So I went to my room and got my gun, cause I always carry it,
AC: I just went back in the living room I went 'what is your problem?'
O: With the gun in your hand
AC: Yes! And I said I want you to put that bat down and he wouldn't do it, he was like, and he came at me with the bat again, after he'd already hit me in the head, so I shot him to stop him.
O: Okay then what happened?
AC: That was it.
Just clipping this down to the core of his story.
If there is a police officer anywhere who believes Alex is telling the truth here, they are in the wrong job.
He has made the liar's classic mistake of forgetting to choreograph Charles' movements in his story. Charles hits him with the bat. Continuing in the same tone, he gives no description of the moment of injury, almost as if it didn't happen. Raging Charles who put Alex in fear for his life stays where he is, simply freezing long enough for Alex to leave the room, and get his gun. Alex returns with gun in hand and Charles just springs back to life, going at Alex again even though he can see he now has a gun.
He also waits to tell the officer Charles hit him until he's been questioned for many minutes, as if he hasn't quite worked out how to say it convincingly. That suggests to me nerves about the big lie.