Rin Maryu:
Fruitions change the mind, and you see this on exit. It's like a computer doing a 'self-test' after reboot.
On the exit of a fruition, the re-booting period is very insightful. What is re-booting? Just doing it now, and it seems the sense of "being" is re-booting. It is absent for a second or two after a fruition. If you are good with apperception, it can in fact be lengthened into a longer PCE.