Spoilers for Game of Thrones season 6, episode 9, "Battle of the Bastards." Duh.

In an interview with Entertainment Weekly, the director of the remarkable "Battle of the Bastards" episode shared how an impossible shooting schedule led him to send one of history's most anxiety-producing late night work emails.

One evening I got home and I kind of knew we couldn’t finish in the time we had left so I wrote a long email to David and Dan and the other producers to suggest an alternative that I thought we could achieve in the remaining time, but that would mean going “off book” for three days. That is to say, we’d be shooting without a script.