Reread the last line that Rika tells Akasaka in that piece. From that there stems two explanations. The triggers itself was Akasaka being able to save his wife thanks to Rika's words, or Akasaka becoming unconciously aware that something was needed similar to the other characters. (like Shion protecting Satoko from every word since Tsumihoroboshi hen, etc.)
And indeed, piece 51 is from a word were both Rika and his wife died.
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