After busting into Arkham, stealing a prisoner and running back to Jump-CIty the team!- well Robin had done it! as the other members of the teen titans would stare at him either annoyed or uninterested with Raven giving Robin some major side-eye saying to Robin disapprovingly

Raven: ...So let me get this straight... you broke into Juvie section of Arkham... stole a prisoner, escaped with the prisoner and now want this Arkham Prisoner to be our fellow teammate...???

Robin: YES exactly and I'm the leader and I make the rules, so welcome our new TEEN TITANS TEAM MEMBER!!!