Escape from Liberty Gardens is the final chapter in the Left Behind DLC of The Last of Us. It depicts Ellie and Riley's escape from several Infected and how Ellie received the bite that led to her immunity.
Ellie and Riley manage to get out of the music store and barricade the door with a heavy crate. Riley sprints towards the exit, Ellie questioning about their backpacks, but Riley responds "Fuck the backpacks". Riley opens the door but is met with more Runners. The pair force the shutters in the room up, Ellie frantically pushing a cart under the shutter to keep it up. Riley comes through, shooting a Runner dead.
Riley shoots the lock off another door, forcing her way through. The two sprint to and over a truck. Riley stops to let Ellie catch up but pushes on as the Infected close in. Ellie crawls under some rubble, but is grabbed by a Runner. Desperate, she frantically kicks it to death. She catches up to Riley, who is struck by a Runner herself. Ellie jumps on to the Infected and furiously stabs several times with her switchblade. Riley is shocked at Ellie's brutal attack, but carries on up a flight of stairs.
The pair quickly realize the scaffolding near the roof is their only way out. They reach the top, but more Runners block their path, forcing them to divert from the hall to a room but are blocked again, vaulting onto the scaffolding below. Riley succeeds in making the jump but Ellie struggles. Riley tries to help her but Ellie makes her keep going as she pulls herself up, with Runners right behind them.
They finally make it to an open window, climbing up as fast as they can. Riley reaches out to Ellie but the ledge gives way, Ellie falling down below. Dazed, she is unable to prevent a Runner from tackling her to the floor, screaming for Riley's help. The Firefly shoots two Runners and goes to help Ellie up, but is tackled by another Runner. Ellie falls on top of it as she forces her switchblade into the Runner's throat, splitting it open.
Ellie is relived that the Infected are finally dead. Riley, however, is not as joyful, looking at Ellie's arm. Ellie looks down, noticing her bite wound. Ellie is shocked, wiping the blood from it only to find the wound still remains. Riley reveals that her hand is bitten as well. The pair are Infected.
Overcome with anger, Ellie smashes several plant pots with a pipe before tossing it away, crying as she does so. Ellie cries as Riley gives them their options. Option one: they commit suicide to ensure a painless death; Riley isn't a fan of that. Option two: they fight the infection for as long as possible, so they can live as long as they get, regardless of the length. Riley doesn't want to give up on living, but Ellie wants a third option; her friend admits there isn't one. Riley gets up, saying they should leave before more show up, Ellie wiping her tears away.
In the present day, Ellie successfully stitches up Joel's wound, admitting that she's had practice when she stitched up her bitten arm. Once done, she straps Joel to a sled, wraps him in several blankets, and prepares to leave the Plaza on Callus, thinking back on what Riley said to her so long ago.