It's from Halloween Kills, and is kind of out of context, the whole point of the movie was basically people being thrown into the meat grinder unprepared because they were trying to be the hero even if they have no idea what they are doing (via mob mentality) just before this, she was in a group of people and saw a kid die, as well as the rest of her group and husband, and initially was running away before turning back when her husband was killed and just went apeshit, leading her to blind fire and die here. The entire film is basically a commentary about how fear spreads in a community and the issues of vigilante justice and lynch mobs, especially among people who have no idea about what is actually going on and is just jumping onto it.