Damn baby spruce just in the way !
I think that he made a notch. During the first part (at 0'20"-0'25"), he looks very closely where he cut on the downside. Isn't it to insure that the both cuts of the notch meet correctly ?
After that, a quarter cut with a wedge, then the second quarter cut in two times.
He's very surprised and doesn't understand why he got that, because he has a close look again at the stump to find what's wrong with his cut. Not everybody does this on his stumps (but should), messed or not. Maybe he isn't a certified faller, but at least he seems to be a good enough treeman, at least in my eyes. Or will be...
Too bad we can't see the stump like he did. I bet he got the answer at his question.