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The only 2 people that were shown to have solved the epitaph and also were given the "ring of the head", were Battler (+ Erika who probably never reached Rokkenjima), Eva and "Beatrice", but lets put her aside for now.
So we have Eva and Battler. Both solved the epitaph in one Episode and both were able to survive (at least physically) the incident.
So my theory is as following: Eva solved the epitaph first, got the head ring from "Beatrice" and started searching the tunnels for a way to transport the gold out from the tunnel (possibly because of greed, but she had no intent of killing anyone for it). Later Battler also solved the epitaph and... "to be continued".
Maybe Eva got shocked to see him and shoot/CQCed Battler, which caused his "brain injury" later? Well I don't try to make a forgery here, but instead try to create scenarios that seem plausible. But with all this I still don't see why someone would turn the bomb switch (if it even really exists like that)
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