Beidou had set you up to train with someone, who you're not quite familiar with, to try and better your swordsmanship skills and combat techniques

Now, you were in a clearing area somewhere mostly amongst the trees and bushes, face to face with your platinum-blonde haired 'opponent'. His features were soft, as well as those red, ruby eyes of his. He gave off a sense of calmness and reassurance, especially that smile he wore the entire time. He seemed quite harmless and a 'soft' kind of guy. While observing and sizing him up,, thinking how you could easily beat him in a fight, you heard him talk..

"I, Kaedehara Kazuha, humbly accept this duel"