The latest episode of HBO's post-apocalyptic thriller drama deviated from the game’s narrative to tell a deeper story about the characters, including Gail and Eugene.

Just when we thought the wound of episode 2 might be healing, The Last of Us picks at the scab with episode 6. A flashback episode shows Ellie (Bella Ramsey) and Joel (Pedro Pascal) in happier times, specifically, with a series of Ellie's birthdays in Jackson.

HBO's The Last of Us has already filled season 2 with jaw-dropping, shocking moments. But none of them – including the death of Joel (Pedro Pascal) in episode 2 – have hit as hard as the twist in the final moments of this week's episode. And it all comes down to two, game-changing words from Ellie (Bella Ramsey): "I know."