Following him could be a solution, but remember: she can't leave the festival... which means, the only one that could supposedly find the truth about tomitake's death is unable to do so. If she could have followed him, I think she would have already done it. Remember that even Rika doesn't know all the details about the chain of events: she simply knows more than the other characters, but not enough to make a solid story that everyone will believe.
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