It was two statements: "only outcome the participant can expect to experience" because I think that no, it is not possible to experience a null experience; and "will experience with certainty" because I believe quantum mechanics, when interpreted literally, means that the experience will exist.

As I said, I don't find the Russian roulette a particularly interesting scenario in reality, nor something that I would like to try myself; it's because I think this applies to other life-and-death situations as well that I think the basic question is important.