The foot soldiers had to crouch and bushi (samurai warriors) of high standing had to pull the arrow on top of a horse during the battle that it came in the way with the ground or horse when the bottom part was long.
戦時、歩兵は身を屈めながら、身分ある武士は騎乗で弓を引くため、下が長いと地面、或は馬に弓が当るため邪魔になる。