The air coming out of the cone does not blow the ball away, but gives it support because of pressure.
Air moving around the ball has a lower pressure than still air under the ball.
The high pressure of the still air keeps the ball floating. The same principle that keeps this ball aloft also allows airplanes to fly. An airplane wing is shaped so that the air moves faster over the top of it than the bottom . The lower pressure on the top of the wing produces a suction. And, the high pressure on the bottom of the wing pushes the airplane up.