This is a bushbaby and not a cat.But it is a bit like a cat, with large eyes at the front of its face.It has good binocular vision, so it can judge distance well.
Its website explains why eagles, hawks, and owls see so well: " Raptors have powerful binocular vision, where both their left and right eyes can see and focus on a single object."
So as they are sizing each other up, they are gonna be really kind of looking from side to side, but if one moves quickly, it's gonna get out of that binocular vision.