So if you move the ring up to hit very high on the toe of the steel, the spring is forced to stretch more on the way down the radius of the toe and that creates more pressure drag on the steel down the length of the runner.
If you start too high you can drive the wheel directly into the toe and that's when you get the chatter and even possibly a brief stop to the wheels rotation.
The finish is not as good as hand sharpening, which I kind of expected.
The machine won't cut out on you, and you'll still get an acceptable sharpen, just not as clean.
Are your observations the same or different? Is she doing the right thing? Photos and other evidence from the home shows Cody Amato was shot as soon as he walked in the door.