Oh wow. There is a movie in 1990 that Ruruoni Kenshin might have been based on.
Okita Soji does "dojo yaburi"(道場破り/どうじょう やぶり) in this scene ― making a challenge at a kendo hall (and bringing its members to their knees). She wins and gets the hall's symbol ― a door plate made of wood and written in brush with India ink stick [sumi/墨/すみ]. But they're not satisfied and pursue after Okita. Okita meets them again in a manner of fair tactic uses the Mine-uchi (reverse edge sword) in order not to kill anybody.