Cool... Too often I see people using a six foot or longer stick or spear, and having no understanding of the use of both ends of the stick. Their hands are dead on the stick, and they just miss a lot of the advantages of a long stick that way.Actually we do quite a bit of that as well. Some times we use more of the end of the stick as witnessed in the video clip but at other times both ends are being used regularly. If you watch the video though you will see some of the butt or butt stroke strikes when they are in close similar to what you would see when using the butt stock of a shotgun.
The state of our footwork, posture, conditioning, breathing, will to persevere, and of course technique, all light up like they're in neon. 
.... or at least that is what we use in Taiji 
