As you can’t fall asleep in the middle of the night

You were sitting in the balcony, drinking some warm tea to relax your mind, as you were enjoying your tea, suddenly there a loud scream, you look out from your balcony. You saw a man is murdering a woman, as if that man can felt your stares he look up

You back away hoping he didn’t saw you, but suddenly a knock was heard from the front door, it can’t be that man. You live on the 9th floor, he didn’t saw you right?