I'm not going to defend him, but those limbs are difficult to cut without tearing sometimes. When I do those I like to keep my rope in bag on my belt to prevent that kind of thing. The best cut for those tough old fir limbs (lots of heavy conifer limbs) is a sort of bucking cut- cut bottom and both sides as much as possible (no undercut) and then fast from the top a little behind the other cuts.
Watching the vid slowed down, the torn strip on the end of the limb catches the orange thing hanging off his belt, probably his wirecore lanyard as it's obviously not around the tree.