The cutscene begins at 15:31 and ends at 17:11

Typhon Imperator, Throne Room

Calus stands before his throne and begins to step towards the Witness. He holds his chalice in one hand and gestures around with it.

Calus: My Witness, there have been... complications. Our hold over the Veil has been...temporarily loosened.

The Witness steeples it's fingers and turns away from the approaching Emperor. Calus halts. The Witness begins to float away.

The Witness: You fear loss, Emperor. Your fear...brings you pain. We know pain. Our purpose...is its end. You have no purpose...because you fear to seek one.

The Witness looks over it's shoulder at the Cabal.

The Witness: That fear...is your failure.

Calus begins to pace around the room, his arms waving wildly. He walks past a number of relics on plinths.

Calus: My failure? My failure?! I have fed this force with vicious subjugation, battered down the gates of our enemies, and seized our glittering prize!

He turns and points with a thumb towards his chest. The Witness watches.

Calus: Why? Because I wanted it! You hold the universe in your grasp, and all you can think of to do with it is—

The Witness narrows its eyes and the air around it shatters like glass.

The Witness: ENOUGH! Secure the Veil. We will create the link.

Calus looks up and trembles. A stream of blood goes down his face from beneath his helmet.

Calus: Infinite apologies. The Veil is yours. It will be done.

Calus awakens with a jolt atop his throne. He looks at the chalice in his hand, gripping it so forcefully it begins to crack. He roars and throws it across the room.