This is an interesting question - can the GM, having put
killing on the table, allow the players to take it off (eg treat it, from their side, as a capture conflict, which is what
@Manbearcat seems to be flagging).
My first-blush reading of the books is that the answer is "no", but maybe I'm wrong. A capture (rather than kill) result is one outcome the books flag for a major compromise in a kill conflict, but that seems to be on the premise that the other side is
trying to kill. What if the other side is trying to capture?
I await Manbearcat's reply!