"We had an assistant named Dave Hill," said Benioff and Weiss. "One day last summer he walked into our office and said, 'You know that kid (Olly) whose family gets massacred by the wildlings? The one who runs to Castle Black to let them know the wildlings are nearby?' 'Yeah?' 'Well,' said Dave, doesn't it make sense that he'd stay at Castle Black and become a Night's Watch recruit? Where else is he going to go?' 'You're right,' we said. 'That does make sense.' 'And what if during the battle for Castle Black, he's the one who ends up killing Ygritte?' This year, Dave Hill is a writer on the show.