If there's a better example of stonewalling, I haven't seen it.
Here's a transcript from TPMuckraker for that portion of the youtube clip (it's about 1:30 in):
Notice Yoo's non-answer answer. First he tries to say he's never given the President advice to bury someone alive (not an answer, not even a good deflection) and then he says that no President would have to order that or feel it necessary to order it.
Conyers: Could the President order a suspect buried alive?
Yoo: Uh, Mr. Chairman, I don't think I've ever given advice that the President could order someone buried alive. . .
Conyers: I didn't ask you if you ever gave him advice. I asked you thought the President could order a suspect buried alive.
Yoo: Well Chairman, my view right now is that I don't think a President . . . no American President would ever have to order that or feel it necessary to order that.
Conyers: I think we understand the games that are being played
Not that the President can't order someone to be buried alive.
It should have been a simple yes or no.
That Yoo failed to say "no" should give us all great pause.