Quote Originally Posted by Rater202 View Post
It's literally the only way to hurt fully-mature life fibers.

As long as the parts of Ryuko that are life fibers are intact, the rest of her body will instantly regenerate. As long as she is alive and at least some of her life fibers are intact, the damaged life fibers can be similarly repaired.

Stopping time doesn't really negate it, becuase unless Shadow injured her in the correct manner she'll just regenerate as soon as he unstops time... Assuming that time stop will even work on her, becuase as I've said, she's demonstrated the ability to bend reality via force of will on a couple of occasions and life-fibers explicitly ignore the laws of physics.

(Other life fiber hybrids have demonstrated the ability to survive decapitation and the ability to compress down to two dimensions. Ryuko is a superior hybrid.)

You take two blades and make a clean cut with perfect timing and precision in such a way that perfectly symentricall angles both meet at her heart or brain at the exact same instant.

By the end of the series, that's literally the only way to kill her. Anything less than that will at best be ineffective and at worst make her stronger as Senketsu, her Kamui, adapts to her opponent's abilities.
Ok, but why is it the only way? What are the actual mechanics going on there? What happens if you only make one cut? Why does it have to be a cut?