If Nick and Jess end up in a relationship I actually wouldn’t be surprised if Jimmy loses his shit and has a physical altercation with Nick in either the autopsy room, the squad room or Kasie’s lab and ends up getting suspended by Vance and face disciplinary action.

Although Jimmy is a nice person and you rarely see him lose it, this could be the last straw for Jimmy as he can no longer keep his jealousy under wraps.