You had enough of Idate. You decided that you had to stop with this, now. You did not wanted that the abuse of Idate to others keep going on, much less when you always saw how Idate took advantage of Shirogane and you will only stay without doing anything while Yukisada tried to help him with his injuries. Shirogane and Yukisada tried to stop you because of how Idate can would easily kill you, but you didn't care, you came out determined to finally stop with this...