C72 This is too embarrassing

When I burst out the door, the snitch at the window ran away with his cell phone, and by the time I got out he was already on the stairs. I could see nothing but the black and white hem of his shirt.

I didn't give up and chased after him, but by the time I reached the stairs, the thief was nowhere to be seen. I didn't know if he was hiding or had run away