Why we don't break perimeter.

Absolutely unhinged individual believes himself a famous literary wizard.

Now, we know he is not really Harry Dresden because the doorbell camera kept working.

Joking aside, nothing good would have come by opening the door and facing this idiot. This is when the call to 911 comes to play and you staying inside the house with a clear view of the point of entry from a position of cover and preferably sporting a long gun to repeal possible break-in.