I was wondering if maybe he came up with an alternate system, I've seen pain recently pop up as a metric for wounds that compromises continued capability in combat, and fatigue as a metric for mental effort.
If he is using it the way another system I've seen use them it'd be pretty cool. So much Pain or Fatigue can lead to set back dice to physical or mental tasks. Its a concept I've really grown found of in Modiphius' systems. Makes combat more dangerous, and deadly which is something I personally enjoy as a player and GM because it discourages MurderHoboism.