this door again. >> Video shows a man knocking on a homeowner's door. Seconds later, it turns into a confrontation over concerns about his behavior toward the homeowner's grandson. >> As soon as he rings the doorbell, he immediately covers the door camera with his hand. >> Hey, can we have our bell back, please? No, you can't. This door again. >> Excuse me. That was absolutely >> the police. He's been looking at my grunt. Was this reaction justified or was it too