For those who don't make it all the way through the article, here's the powerful ending:
But an old man answered, weeping. He told Mr. Barash that ISIS had taken his son from him when they swept through his village. The militants had given him a choice: He could give them his daughter or one of his sons.
Crying on the phone, the old man said his son was a teenager, not even old enough for facial hair, and never learned how to fight.
“I told him I was sorry,” Mr. Barash said.