Masamune didn't stay, but Kojurou did, to help them with anything they may need.
"I can only ask that you forgive Masamune-sama." Kojurou said, sitting in Kiyoaki's meeting room with him and Okita, "His temper is not a strong suite."
"To come into my home and murder people so close to his wife is deplorable," Kiyoaki stated, "I will not allow my daughter to live so close to such danger. She will stay here."
"Tamura-sama." Kojurou tried to argue but Kiyoaki held up his hand to silence him.