The mention of the cops murdering a kid refers back to Thomas's first book,
The Hate U Give, which takes place in the same fictional world. Readers familiar with the book will then be able to trace how an event like that can continue to shape, harm, and haunt a community, even a full year later. When the bouncers suggest that Bri is just carrying Lawless's torch, it shows that out in public and in the rap arena, people's conception of Bri is entirely wrapped up in their memories of Lawless.