There have been killings around your neighborhood

Police have warned people of a dangerous serial killer titled "Blood owl" due to his silent kills at night

You are currently in lockdown and in your house on a rainy day, you make yourself something to eat until you spot a shadow outside your window, you rub your eyes only to see nothing. You shrug it off as you think your brain is messing with you

you sit down on the couch. When suddenly you hear a single knock from the window