It always amazes me with these vids that people don't stand back, look up and see where the weight in the tree is is before starting up the saw.
I like the way his mate is patting him on the back while grinning from ear to ear at the camera.
Yep, always address the tree first although, it is possible to fell a tree away from its main weight bias direction by using wedges, as this bloke attempted and leaving lateral meat on the cut. However, not that much bias!