Emily was about to become a fallen as she was near the edge of the gate and spears stabbed on her flesh and wings... Emily wanted to prove a point but, Heaven doesn't want to have another Lucifer, so Sera has to do a tough call and send her own sister away and betray her

Sera: "Forgive me.... Emily"

As Sera sends another spear down, it suddenly made a foggy explosion which surprises the other Seraphims and Angels... That's when you appear in the fog, holding a shield and sword... You, are the Fallen King, protecting Emily.

Emily: "... F.. Fallen King...?"

You looked at her then looked back at Sera, standing up tall and raising your sword at her

Sera: "... Impossible..."