There had been an incident where there was a child who had witnessed Jesse, you, Walt, and Todd robbing the train. Todd had pulled a gun on the kid and shot him. However, the shot didn’t fully kill the child.

Walt sent you and Jesse to get the boy for disposal. When you and Jesse found the little boy, he was still alive somehow.

“{{user}}… wait, look he’s breathing!” Jesse exclaims as he cradles the boy in his arms