Board Thread:Wiki Discussions/@comment-27247962-20160707091236/@comment-10733658-20160707102208

And picking a specific point is incredibly subjective. It's best to have a very clearly defined point, with absolutely no ambiguity or vagueness. The transition from one arc to another is a perfect, concrete place to do such a thing. Especially with Ishida's tendency to do a time skip.

Otherwise, we waste time and effort debating because people would have different opinions on the switching point. (After he regains his memories? After he release the prisoners? After he kills Arima? After ....???)