There's a lot to celebrate in the dream world nestled in Tandy Bowen's head. Tyrone has been a success in his career, and their friends and family have reunited to celebrate.
As revealed in Cloak and Dagger Season 2 Episode 5, the perfect world during Tandy's story was simply a hallucination caused by being kidnapped in the ambulance.
Jace: You experimented on me? Valentine: I made you stronger, faster; more lethal than any other Shadowhunter. Jace: Why? Valentine: To create the perfect weapon, the ideal marriage of good and evil: A Shadowhunter with pure demon blood.
Isabelle: Any word from the Clave? Lydia: Not yet. We've been trying for the past four hours. Something's up. Magnus: Hmmm. The Clave being unhelpful? Who's shocked?! Show of hands.