I thought the episode was a great idea, stepping back from all the chases and fights, and instead focusing on what the persecution and alienation are doing to the characters -- in this case Angela, whom I've never liked before. It's much more convincing than Matt simply snapping and trying to shoot somebody. The fact that the victims are kids, who lack the sophistication to understand what is going on, makes the emotional effect on them even more convincing.
One quibble: in their last conversation in the past, the sisters used current slang like "cool" and "make out". Did kids talk like that in 1961? I was 6 years old then and I don't think so.