When Claire finds Leon hurt in the sewer, he tells her what happened to him; a woman tried to shoot Ada but he jumped in front of the bullet, Leon asked Ada to work together with him so they can all escape the city alive, and she agreed.
Leon: "I got shot... There was a woman-"
Claire: "Wait, you mean...?"
Leon: "No. Not Ada. She-"
Ada (flashback): "You're losing a lot of blood. Don't move. I've gotta remove the bullet."
Leon (flashback): "Who was that?"
"She was about to kill you."
Ada (flashback): "That's my problem, not yours."
Leon (flashback): "Fine. Don't tell me."
"But you better start working with me here, or we'll never make it out of this alive."
"Please, Ada, I need your help".
"I can't do this alone."
Ada (flashback): "You're right."
"I'll help you."
Leon (flashback): "Thanks".
Ada (flashback): "But first, we need to find the others."
"Don't die, Leon. I owe you."
Claire: "I guess she's on our side then. Lucky us."
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