CHAIRPERSON
Mashinela had sent this person and if he did not return, Mashinela surely would know that something must have happened to him from your side and that would not stop Mashinela from proceeding to launch retaliatory attacks against you.  Do you get my problem?  The reason why you decide to kill him, is to prevent these retaliatory attacks, then how do you prevent something when the dying of a person, will obviously incense the other side, because if he doesn't return, they must come to the conclusion that something terrible should have happened to him and still launch retaliatory attacks against your small group, so the objective of killing him, which is to prevent retaliatory attacks, does not become achieved.  Are you with me?  You do not stop Mashinela from retaliating, you probably make him even worse, because now he doesn't see anything that resembles a person he had sent to kill you.
	Now I just can't understand the objective that you've sought to achieve by killing him, because it does not remove the threat that made you to decide to kill him when the other group had decided that he should be released.