- Jennifer Goines: Lasky! Lasky, time for some real talk, me and you. Olivia: yeah or nay?
- Dr. Lasky: Nay.
- Jennifer Goines: Killing our friends?
- Dr. Lasky: Nay.
- Jennifer Goines: Big nay.
- Dr. Lasky: Super nay.
- Olivia: James and Dr. Railly are tracking their son, which means they're learning to think like him. There are no straight lines. The Witness knows this. So stop thinking linearly.
- [last lines]
- The Witness: [finding Sebastian dead] We will meet again, old friend.
- [takes off his mask]
- Athan: When the forest is red.
- Katarina Jones: [lightening a cigarette] Imagine for a moment, you were me. What would you do?
- Olivia: Quit smoking.
- Dr. Cassandra Railly: London fought the Great Plague starting in 1665. There have been outbreaks ever since, but, historically speaking, here, now, there's nothing. Except... I found this.
- [she shows Cole an advertisement on a billboard]
- James Cole: A party?
- Dr. Cassandra Railly: A ball.
- Dr. Cassandra Railly: [reads] "Exquisite dining, dancing and music for those of particular heritage and means."
- James Cole: Who'd celebrate a plague?
- Dr. Cassandra Railly: There's nothing rich people like celebrating more than their own privilege and survival. Sick is only sick if it happens to rich people.
- James Cole: Sounds familiar.