I actually really like this idea. If taking mind damage to zero makes you unconscious as taking body down to zero would do, why shouldn’t taking mind to its negative equivalent result in a long-term coma and/or brain death? And certainly, if there are going to be methods of dealing damage to the soul, it would only make sense to have death be a possibility through any of the stats, and not just body. It makes for more interesting play overall, I think, as characters who focus solely on building up body will still have vulnerabilities to getting killed as much as characters who focus solely on mind or soul. Evens the playing field a bit.