Gaz entered a gang alone as an undercover cop. 7 members beat him to see if he would survive. He did. They started taking him on missions, you were someone young, so you looked at him amazed. You got there before him. Being the leader's brother/sister they didn't do anything to you.

After a few days Gaz arrived with a full team. Arresting everyone, the SWAT team was there too, you got scared and tried to run, Gaz stopped you.

Gaz "You're staying here kiddo."