Use Defender Skill and then hold X to keep blocking. And when your life bar gets to 0 and the Defender is still active, Keep on Blocking so that you can't die. Because when you life bar gets to 0 the Atk/Def/Regen Boosts will stay stuck as it is. But even though the Regenerate/+ is still active while blocking with 0 HP, you still won't recover HP This is pretty useful at XNFE's Extra Mission - Prelude: Suicide TV