I can see how you could, then, look down on me from all the way up there. Q1 What does "how" mean in the sentence? how mean in which way, in what manner, I see how to do it. I see the way to do it. I see how you could think that. I see why you could thinks that (from some understood perspective) How could you do that? I see how you could do that. Q2 There is a "could". If I use "can" instead of "could", it will be unnatural? Can works. It changes it to present, instead of conditional. I can see how you could, then, look down on me from all the way up there. - They may, or may not look down on him. But he understands that they could, maybe. I can see how you can, then, look down on me from all the way up there. - They do look down on him, and he understands the manner by which that happens.