Stills can't show how violent this can be. It seems it would really hurt, but then, to feel pain, you need nerves and a brain, and these one celled animals have neither. The whole process only takes about 15 minutes or so.
Here is the video, even more fascinating to watch than I remember, when I recorded it.
1. First it starts with a tightneing of the belt.
2. Then you suck it up.
3. A few truns to pinch it off.
4. Then you just pop it loose.
5. And BAM, your off on your own.
Images made through a microscope. All subject types.