That HD combo he did at 12:51 was this:
c.b, c.b, s.b, HD, s.D, QCF+D, D, U+D, [HDC], QCB+A, QCF+D, D, U+D, [HDC], QCB+A, QCF+P, QCF+D, D, U+D, [HDC], QCB+A, QCF+P, QCF+D, D, U+D, [HDC], QCB+A, air throw.
Based on that video I think it deals about 400~ish damage since he was well below half life and it still didn't kill him.
Something interesting I noted during his match against Clark.
He does command grab, whiff s.D, step forward, jump d+D (drill). It looks like it'll cross up but can't really tell what the end result is suppose to be since the Clark player did EX clothesline to escape the setup.