Board Thread:Questions and Answers/@comment-26138409-20160306224346/@comment-17964257-20200315213224

> passive skills and abilities to reduce and heal damage instantly, or near instantly, most likely reducing the pain felt in combat even more.

Afaik, there is no information of such a thing existing. You feel impact, not that your HP is draining.

> This would account for the disparity in their reactions to life or death combat damage

The disparity is because... Well, some are life or death situations, some aren't... Also, human reflexes are still there as well, if there is a sharp object that just cut through you, you will react in certain ways whether you want to or not, whether you feel the pain or not.