[M. Bison]

he still doing the objective he stabed the guy and he was going to win because he had more health!

If the knife fight timer runs out then it'll slay a random person. This means he has a higher chance of dying by not continuing. If he didn't want to have a knife fight then he shouldn't have agreed to it. Agreeing to a knife fight changes the primary objective to knifing the opposing player to death before time runs out. People must make a reasonable effort to successfully knife the player to death or they are ignoring their objective. This means running away with no intent to kill the opponent prior to the timer running out is ignoring the objective. You have to remember that there are dead people in spectator waiting to play again. They don't want to see some guy running away and drawing out the round.