[ There's a moment of concern. Does he really look dumb? He has to try harder. ]

I think the risk of the votes not being anonymous would be too high. That itself would be interesting—assuming one person did decide to sacrifice themselves, the others clearly didn't. The others would have a higher sense of self-preservation than that one person, who is apparently an anomaly.

Assuming that's the least likely case, it's entirely possible they agreed beforehand. They could have known that abstaining would lead to randomization between members and that would also threaten their lives. We could assume the same might happen in this trial. Besides, if they didn't want us to know how many of them there were, all of them voting would have been stupid since it would have given us a number.