Fear Nothing

Missy Peregrym (Maggie Bell) was pregnant with her second child during shooting of this season and was written out of the show during this episode in a way that allows her character to return at an undisclosed later date.

OA says that he witnessed a sarin gas attack in Mosel when he was in the Army. While it is true that the last publicly known use of sarin in Iraq was in 1991, far to long ago for OA to have seen it. However OA was part of the 75th Ranger Regiment, one of the Army's elite tier two special operations units. Most of their missions are highly classified so it is possible for OA to have witnessed the use of sarin on a small scale that was not known to the general public.