The character demands this, but when his opponent goes to do it, grovels.
The opponent simply ignores him.
The opponent gets him medical attention because he's out of his head with pain.
The opponent was waiting for The Medic, so he can save the character.
Parodied: The character demands it in a paintball tournament.
Zig Zagged: The character makes a speech about the value of life and the value of honor, leaving the foe very confused as to his desire. Foe makes a move to kill the character, to which the character screams "Wait don't do that!" Foe begins to walk away, and the character again pleads "You're going to just leave me? Please! I'd rather die now!"
Averted: Characters all die without being incapacitated.
Enforced: "If he doesn't die on the battlefield, the logical option is to have him taken prisoner and tortured, and we can't get that past the censors."
Lampshaded: "I can't believe I'm really going to say this, but please kill me now."
Invoked: "Ah, this is the point at which you tell me to kill you, because you do not want to hear about it."
Defied: "I never will ask you for anything, Dark Lord — even my own death!"