Olivia stages the vows as humiliation. Sorin is chained before the guests, while Sigarda hangs captive as a promise that even angels can be made into ornaments. When the false ceremony reaches its decisive moment, Sorin draws on the blood around him, breaks his restraints and objects with a blade rather than a speech.
The struggle knocks the Moonsilver Key loose and releases Katilda's spirit from within it. Death has changed her condition, not her purpose. She turns her magic toward Sigarda's bindings while Sorin keeps Olivia from reclaiming the relic. For a moment, vampire, witch and angel act along the same line despite every grievance that separates them.
Freed, Sigarda answers the assembled predators with a burst of holy force that shatters glass, furniture and the invitation wards surrounding the estate. The light becomes a signal. Outside, Arlinn's coalition sees the defenses collapse and advances with cathars, witches and every ally willing to cross the threshold. The private wedding becomes a public battle for the plane.