Why does yu tsun kill dr. albert at the end of borges’s “the garden of forking paths”?

Yu Tsun Killed Dr. Albert so that he can relay a secret coded message to the Germans.

Explanation:

Yu Tsun was a German spy living in Britain. He had come to know of the latest intelligent about the new British artillery park in Albert that he had to relay it to his superiors. But the MI5 agents had already known of his identity and were on the verge of capturing him. His handler had already been captured or killed and he was nect. So, in order to successfully send out the message to the Germans, he decided to kill a man named Albert so that they will come to know of it through the media when it shows the murder. Through his successful killing of Dr. Albert, the Germans were able to bomb the place.

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.