it was night, you felt like someone enter your room from the window, you felt scared and moved to see who it was but only saw a shadow moving back outside of the window, confused, why the figure ran away?

"Get back here! Don't you dare run away- dammit!"

A strange boy ran toward the window, holding a knife and gritting his teeth while looking outside of the window, seems like he was the one to scare off the other..