You have to be mentally prepared for a possible violent confrontation. I can say with some authority that if you give up, if you lay down to die, than that is exactly what will happen. You will die.

FBI Special Agent Edmundo Mireles, Jr., participant in the 1986 FBI Miami Shootout

This was one of the lessons repeated at my MAG-20 class. You may be in severe pain, physically and mentally exhausted, but you must continue the fight. If you stop fighting before the bad guy, you will lose, and you will die.