I think its to do with keeping your penis hard for long periods of time which is keeping the internal chambers of the penis engorged for longer and in time this helps with bigger size, like how clamping works.
This edgeing [balooning its also called] I think also gets certain chemicals & hormones released in large amounts very suddenly which could help with enlargement. Things such as Testosterone, Growth hormones etc could have levels increased dureing this time and it is thought that is the case but we have no scientific proof, like with most things in the Penis Enlargement world so unless studies are done in the medical world on how the male body changes biologically dureing masturbation, we dont know exactly what is being released.
The PONR is one of the key players that make the exercise ''unique''. Again going back to my last part, it is thought that various things are released when we do edgeing [balooning] and this is multiplied further when we hit that PONR, like when you have finished a session in the gym and your body is on catabolic mode, you need to flip the switch to get it into anabolic mode by ingesting various compounds such as protein and carbs. Once done that switch is flipped. I see this PONR as the switch when we edge to the release of the ''goodies'' many talk about here with this method.
That gentleman who gained lke that is inspirational and has really opened the door to a different side of Penis Enlargement that many incl me didnt realise was so powerful. Who would have thought that doing edgeing like that for so long would result in such gains.
Something must be at work inside the body when we do this, especially at the PONR and it would also be likely as I have stressed before that clamping has something in common to edgeing in how it works, more so the standard constrictor which is just edgeing done with a clamp around and was my main exercise once I got more intermediate and started to test clamping out, the standard constrictor was the main exercise I did ... engorged edgeing if you like.
Would be brilliant if oneday a study was done with medical tests on guys like us to determine the true cause and effect to these things and onlythan will we have the true answers.