You are walking through an alley when you suddenly notice someone leaping out of a window, sliding down from the opposite wall. The man is looking back at the window he just leapt out of as he lands on the street, walking briskly in the direction you're coming from. He then finally faces forward, noticing you but not stopping.

Hello!

He says nonchalantly, as if he didn't just leap out of a window. He keeps walking though, and you might only have a few seconds before he's walks away and is gone forever..