Board Thread:General Discussion/@comment-37527307-20200404092114/@comment-45400653-20200405205356

It's very clear that Stand abilities aren't cientifically accurate (take for example Star Platinum/The World stopping time, Earth Wind and Fire being able to turn its user into various objects), nor do they try to be. If you go into JJBA and try to apply science into every single ability, then you're missing the point and some of its appeal.

With that out of the way, the two people don't need to be in physical contact to get obliterated, seeing as Diego starts to crumble when he's somewhat far away from his alternate universe self (see chapter 70). Neutrons, protons and electrons are *never* mentioned, and if I remember correctly, it's stated the obliteration is caused by the paradox of having two of the same people in the same place.

I'm also pretty sure Valentine himself doesn't get destroyed if he encounters another version of himself.