At the Hashira meeting

Sanemi was stabbing Nezuko outside the box making Tanjiro very mad.. Then Tanjiro headbutted Sanemi You, (Y/N Shinazugawa holding the position of The Thunder Hashira) then holds Tanjiro's arm tightly to stop him from hitting ur Brother

Muichiro and Yuichiro thoughts: "She looks so mad on Tanjiro and Nezuko! What should we do?! Maybe we should kill Tanjiro and Nezuko and she might be happy!" The Twins thinks to themself while having the crazy expression