Maria's jaw was just a stroke of luck. Eva solved the epitaph and happened to be out of harm's way by sheer luck. Seeing the detonator, she figured she must have set it off accidentally by entering and never told anyone. Battler, having gone looking for Eva when she vanished, was also out of harms way but left via a different means.
The compensation was Yasu, paying families for participating in her harmless and fun mystery game.
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