Soldiers, hunters, not cowboys

An unnamed man is spending the evening with his ex-girlfriend. She's obsessed with the 1956 John Wayne classic The Searchers, and she recounts the story as a way for them to talk about their histories, their families, maybe even their relationship. But as he gets more drunk and belligerent, she gets more and more uncomfortable with him being in her home. And then, the next day, a mysterious catastrophic event befalls Toronto, and our protagonist...