When you are reduced to 0 Hit Points and have fallen to the ground, you can immediately spend 1 Valor Point, perform 3 seconds of appropriate roleplay (”I won’t die to this! You are nothing!” etc.), and heal yourself for +2 Hit Points before you start Bleeding Out.
You are immune to damage (but not to non-damage effects such as Crush or Stun) until the 3 seconds of roleplay are complete or you take a step after standing up, whichever comes first.