To write it, I started with the scenario: a son and a mother talking about his decision to go to war. Then, I let the story play itself out. I didn't know either of the characters before I started writing, letting them grow as the scene went on. As a result, when the mother begins referring to the absent father, I started worrying about how I was going to deal with it! The key here, though, is not to panic and to trust yourself to find a way. Here, I kind of brushed over the story to a large extent as it wasn't something I felt I had the time to go into.