Dave is ready to share more of his investigative process with you, after demonstrating the introductory phase of his investigations earlier this week. Now you can see that Dave has descended from his perch on top of the box part of the cat-tree. Usually he descends after hearing, seeing, smelling, or otherwise sensing a disturbance closer to the ground. He is very quick, quicker in fact that many cats half his size. Therefore, you won't be able to see Dave's transition. No film known to man can capture the image quickly enough.
You can see that Dave is still facing the same direction as he was before, suggesting that the disturbance Dave sensed is in that direction.
But now you can see that Dave is doubting that conclusion. After seeing no disturbance in to the west, he is looking a different direction, to the south. Dave doesn't mind being wrong about the location of the disturbance. In fact, it is the mark of a good investigator to question one's assumptions. The important thing is that Dave finds the disturbance before it is too late to do something about it.
Part 3 of Dave's tutorial is now available.