but really what is that video going to do for Walt? The police see it and investigate and Hank will be innocent.
Uh, no. Genius move by Walt. He has Hank by the balls on this because:
a.) Hank's medical bills WERE payed with drug money
b.) Hank did take him on the ride along that started it all and there are plenty of witnesses
c.) Who would believe, given Hank's position with the DEA, that Walt, a high school chemistry teacher, could run a drug empire right under his nose without his knowledge.
He mixed in just enough truth to make the story even more believable than the reality.
Of course, Jesse can frick that whole thing up now.