The Driver Mystery

The driver of the car who stopped at the fuel refilling point was filling his car when he saw something there. The owner of the shop at the fuel station didn’t pay much attention to the driver as there was nothing suspicious about him. A middle-aged man with a hat on his head was filling his car and that feed was clearly visible to the owner. He saw that from the CCTV feed on his counter. But then the next moment the driver was not there. The owner thought he might have gone to the washroom. He didn’t go the washroom but was hiding. But why?