https://youtu.be/toVfvRhWbj8
I know how it works but I've never seen it before...especially like this.
I noticed a blue haze where his hand is acting like the choke near the end. That looks weird.
I especially like watching the droplet suspended in the venturi and then exploding when the low pressure hits it from the piston side of the venturi. He's using a high speed camera and that droplet disintegrates within a frame or so of the pressure change. Hmmmm!