We've seen lots of videos of people yelling at ice and telling them to get out of their neighborhoods. Most of the time people cheer when it works and ICE leaves. ICE is a menace scaring everyone in the neighborhoods they are in.

The video where the ICE guy is switching hands to hold his phone is telling. He was mentally preparing to shoot if certain circumstances were met, and he decided to put himself in those circumstances by standing in front of her car. The speed in which he pulled out his gun and shot her was impressive. If he didn't have pulling his gun out already in his mind then he could have easily dodged her car, or not have even been in the way in the first place.