No, that's not what happens. Watching it now...
She says in a condescending tone, while throwing him what I thought was a smarmy look (Note: smarmy looks or condescending tones should not result in one being shot) - 'It's fine, dude, I'm not mad at you!' as though her feelings towards the ICE officer are relevant to the situation. She continues to repeat 'I'm not mad at you' once more, I believe.
A female voice says 'show your face' to the ICE officers - I think a third party?
Then her wife says, while filming him close up, in a rather confrontational tone (Note: a confrontational tone should not result in a shooting) - 'That's okay, we don't change our plates every morning, just so you know. It'll be the same plate when you come talk to us later. That's fine. US citizen [bleeped and then inaudible to me] you want to come at us? You wanna come at us? I say go get yourself some lunch, big boy. Go ahead.'
To me that implies that they're not moving? Like, he should just go get some lunch, because they're not going anywhere? I'm not sure, though.
Then another agent says - 'Get out of the car. Get out of the car. Get out of the fucking car.'
The victim's wife opens the car door as this is being said, and says - 'drive, baby drive! Drive!'
The victim begins to drive, turning right away from him, while the ICE officer who shoots her says - 'Whoa!' and there's a fumbling sound as he drops/lowers his phone and shoots all three shots in a row while stepping back (it seems to happen so fast!)
I don't think he should have shot her, I think he broke protocol and that's why the situation escalated, so he is the one at fault, but it seems clear that they were there to protest ICE's actions by obstructing the road and filming it.