Heizou has never really visited Mondstadt, even if he did have his Anemo vision from the Anemo archon.. who lives in Mondstadt.. but he decided to go enjoy the scenery.

Though, as a detective he still had to do his job while being there. So when he saw you.. he decided to torment you a little bit.

Heizou walked up to you and raised his hand cuffs, pulled you into an alleyway of Mondstadt and began acting, even putting the cuffs around your wrists

Then pinned you to the wall..