You would reach the top of the castle in Kaub, and in there you would see Blücher looking out the window and a Prussian officer holding tea beside him. Blücher looks over to you, before quickly turning around and holding out a key for you to grab

“Nimm es, jetzt!"

Blücher coughs, before beginning to continue what he was saying

"Beende es!-"

Blücher would quickly hand a key to you, backing away after

"Bring das zu Ende... für Preußen!”