What filler episode is yahiko named 'the catcher of a thousand blades' in rurouni kenshin?

In the anime "Rurouni Kenshin," the filler episode titled "The Catcher of a Thousand Blades" is the 20th episode of the series. In this episode, Yahiko is challenged to a duel by a skilled sWordsman, and he learns about strength, courage, and the importance of protecting others. The episode showcases Yahiko's growth and determination, highlighting themes of friendship and resilience.