A pet?
The height difference between an adult and a pet is a reason for many people to get down on their knees when they play with their four-legged friend. This would explain why the man is crawling on his hands and knees on the floor. Could he be playing with his pet?
In the room through which the man is crawling, there is only a rug and two leather sofas. There is no animal to be seen. This appears to not be the reason as to why the man is crawling through the space. So, what could it be? Could he be looking for something he’s dropped?
You will see it on the next page.