A Knock
As he confirmed that Alexander was home for sure because of the lights being left turned on, he knocked on the door to check and make sure that Alexander was doing just fine and that they were just overreacting about him not placing an order for that long. Lights were all on and it is evident that someone is home. The TV was even turned on. There must be someone inside if it is not Alexander. However, he was sure that Alexander would go to the front door and be the one to open it.
Ignoring Him
As sure as he was that Alexander was home, he knocked once again when he received no response in his first knock. He kept knocking at the door as if he’s really sure that someone would open it up for him but to avail. No one opened the door and no one even answered or shouted anything. He didn’t even hear any voices from the inside to ask who he was. He then took out his mobile phone and called Alexander’s number. He still did not get a response. This time, he’s nervous.