I've been Dick Cheneyed a few times point blank by my own players but never been hit in a surrender.
Forgive me if this is braggy, but I have never been surrendered. I have never been knifed. I've been shot all over, nerfed, nuked and had the flag hung on me but no player has ever had my surrender or my scalp. I'm certainly not saying it couldn't happen, only that it hasn't so far.
At Hell Survivors War Game, we have the spin factor. You have every right to call for a surender and the victim has every right to say no thanks and spin on you. Overall this rule, while it discourages surrender is more possible to ref and avoids whiny he said, he said arguments on the field.
For me the knife is a symbol of a gentlemen's game among sportsmanlike friends.
This is the weapon of a Jedi Knight. Not as clumsy or random as a blaster; an elegant weapon for a more civilized age.
I only said final.. not short! Still plenty on the list to go!