A warrior considers himself already dead, so there is nothing to lose. The worst has already happened to him, therefore he's clear and calm; judging him by his acts or by his words, one would never suspect that he has witnessed everything.
Only the idea of death makes a warrior sufficiently detached so that he is capable of abandoning himself to anything. He knows his death is stalking him and won't give him time to cling to anything so he tries, without craving, all of everything.
A warrior thinks of death when things become unclear. The idea of death is the only thing that tempers our spirit.