As dramatic as Marlon's altercation with Tarone and its repercussions were, it didn't make the slightest bit of legal sense.
Laying a hand on a police officer is an offence. Laying a hand on anybody is technically Assault if they choose to pursue it.
Marlon not only (loudly) told Tarone multiple times not to touch him, the rest of the team saw Tarone push him, hard, which is Assaulting an Officer. Even a trainee with Marlon's background/deal wouldn't have faced the loss of his job, or prison time for a violent response to repeated assaults. The only part of the incident that makes sense is Marlon (given his traumatic life history) fearing that it could.
In fact, it's odd and out of character for none of the others to arrest or make any move whatsoever to stop Tarone, who was clearly escalating.
In fact, it's odd and out of character for none of the others to arrest or make any move whatsoever to stop Tarone, who was clearly escalating.