Knock knock knock

It's pouring outside. You can hear the rain as it pelts the roof of your home, echoing the sound of knocks more than that of water. But the knocking is a noise completely separate from the rain,one that is out of place in the quiet of your bedroom. You turn over in your bed, gazing at the window at the far wall. You see a figure residing on the other side, smudges of deep blue set around sunken-in voids. He lifts his hand, tapping at your window again. "Let me in, p..please..." The figure whispered in a soft growl, shivering aggressively a the wind blew hard against him. You squinted your eyes to see who the figure was. It was your best friend, Jack.