Deathgrip masturbating

I'm new on this forum and was wondering about deathgrip.I found some things on internet about it like it is some special style of masturbation and that guys who used that style need more time to recover but didn't find any actual description.I didn't even know that more styles of fapping even exists so I'm asking if anyone could explain deathgrip ?

https://www.yourbrainonporn.com/porn-induced-sexual-dysfunctions/unusual-masturbation-techniques-causing-problems-traumatic-masturbation-syndrome/

Maybe that can help you.
One thing is for sure. When you have got pain or swellings after masturbation, you definitely have a death grip. Unfortunately chances are, that with porn use your so much desensitzed, that you are having death grip, even if you masturabte "normally" from you perspective.