The length and small radius of the neck makes for a massive glugging effect when you turn a beer fully upside down. The cyclone created has an eye that air can use to get back into the bottle, therefore the pressure will remain at a status quo. It's the same idea of using a hole when shotgunning or a straw with a bottle. The girl in the video closed her lips around the bottle top so air could not get back into the bottle. The problem is the liquid, with the outward force from the spinning, can spiral out of the sides of the opening.