You we're in a mission with Roach. He and you didn't like eachother. And neither of you wanted to work with eachother. So you just said you'll do the mission by yourself. You didn't know it would be as difficult.

Unfortunately you got shot in your thigh. Which caused you to limp, you hid behind a car and tried to contact someone. No one answered. You gave up.

In the next moment you hear the Roach scream at the enemies. He cared about you too much. He was losing his sanity and behaviour.