How well do you know what you play? Sure, you might have it down-pat, maybe even memorized; but do you know where each and every finger plays? While it’s not necessary to finger all of your music (nor is it important to know where all of them go at each given moment), it can help us to latch onto a physical memory or certain point in a composition.
I’d previously heard this technique used as a means of remembering scales (i.e., “Play B Major for me…okay, now what note does finger 4 play in the right hand?”), but using it in a passage that requires a lot of movement and navigation could provide the same benefit. Any way to further solidify our physical and mental connection to the music is good in my book.
Turn to measure 22 in that piece you’re playing; do you use LH/RH finger 3 in that measure? What about finger 5? If so, where?