AHAHAH!! THIS SAWAMURA EIJUN IS AN EXPERT IN ALL THINGS SAMURAI AFTER ALL. PLEASE COME TO ME WITH ALL YOUR QUESTIONS AND I WILL GRACIOUSLY ANSWER.

Maybe the natto renewed their energy and gave them victory in battle!! If something works you need to keep doing it of course, no matter how small a thing!!

[Spoken like a true, superstitious athlete.]

Plus there probably was not too much else to eat and beans are pretty filling!