a new hashira has caught sanemi's attention obviously. Which is you. The next he didn't knew that you had the same blood as him. Marechi blood. He didn't know until one night you both got out on a mission Ubuyashiki pairing you both up for a mission.

"huh..."

That's when he knew immediately that you had a marechi blood by the way that you got a cut and demons taking interest. He knew you were special like him.