Some of those points were asked and answered in Julian'a testimony. I think in relation to Juliana describing Joe looking shocked, from my point of view, it would be because that was likely in her account to police and it's the prosecutor's job to set the scene with as many of her observations as available, to give the account as much credence as possible. It's the sights and senses that make the retelling of an account believable or not. In my experience liars tend to forget to give those little details, because they never saw it and forget to imagine it. IMO
6.53.57
Q. And what did you see when you went into the bedroom?
A. When we first get into the bedroom I could see the bed,
the bed we have in the master bedroom was kind of tall, and so from my point of view all I could see was like Joe, at the moment it was Joe, like on top of Christine in a way I would only describe holding her down. And that was my first view as soon as I get into the bedroom.
Q.
Were you able to see Christine at all at that point?
A.
At that point no.
[...]
Q. After Brendan shot Joe, did anyone say anything?
A. If anyone said anything?
Q. Yes. Did anyone say anything in the room at that point?
A. Yeah, because Brendan ran to Christine, [bbm]
she was still on the floor, and I, at that point she had, she had seen me, and she said, she asked 'what did you do?' to Brendan, I think regarding to he shot Joe, and she said my name, she told me 'Juliana call 911'.
[...]
7.07.36
A. And I just started telling him he's moving, he's moving, he's behind you and that's when I fired the shot too.
Q. That's when you, could you say that again?
A. I fired.
Q. And when you say you fired, you fired what?
A. A gun.
Q. The gun that was where?
A. In my, that I had, in my pocket, the handgun
Q. Did you hit anyone?
A. Yes
Q. Who did you hit?
A. Joe.
Q. What happened after you shot Joe?
A.
After I shot him he falls back
Q.
Did you see Brendan touch Joe's body after you shot him?
A.
Touching, touching, no.
Q. Did you see him interacting with Joe or Christine after you shot Joe?
A. Well he was still stabbing Christine and he had, there was, he got her blood, in a handful of blood and he starts dripping on, on Joe's body.
Q. Did you ever call 911 again?
A. Yes.
Q. Why did you call 911 again?
A. I called 911 again when he told me, Brendan told me he was ready for me to call.