Backfire

Backfire is a short story from The Concourse to Victory, book three of the Course Books.

In this story, Hunter and Jason test an experimental version of Kiyoku in a newly-built mobile suit. This version, designed to take advantage of the human brain's compartmentalized nature, could theoretically allow a pilot to keep track of more targets and perform more tasks simultaneously.

Instead, it traps Hunter in his own mind and forces him to re-live events from his childhood, all the while convinced that he is actually traveling back in time. The experience, while unnerving, does provide him with a special gift, and he instructs Jason to "save a copy" of the experimental (and presumably dead-end) system.