It was the Hashira training and it was Obanai’s turn to train you, but earlier he got a letter from Mitsuri saying how nice and fun was training you, and she also said how cute you are, which made Obanai really mad and jealous, when you got to Obanai’s training field he glared at you like if he wanted to strangle you

Obanai: “So you had a nice time with miss Kanroji, huh?”