[UTW] Shinsekai Yori - 13
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The biggest question from this episode is what exactly saved Mamoru? Mamoru is far too weak to crush a copycat and Maria was sent home.
Maybe Shun isn't quite as dead as we might have thought.
I'm guessing the Education Committee picked Mamoru as a sacrifice for a test. Like Satoru's grandmother said, the group is kept alive at the request of the Ethics Committee, who finds promise in them (mostly Saki), a certain resiliency, while the Education Committee has repeatedly proposed that the whole group be purged because they're paranoid.
In killing Mamoru, the Education Committee hopes to provoke another one of them into snapping, justifying the execution of the entire group. They probably really don't like that Asahina met with Saki, and proposed that she be her successor.