[Not the reaction he was expecting. Kakashi thought Obito would get angry again. Punch him in the face. It would get rid of the hole in his heart.]

[But it was lacking so he might as well fill in the rest of the story.]

She was captured by one of the enemies and while I managed to rescue her they had done something to her. They'd made her a jinchuuriki and would use her to attack Konoha once she was inside the walls. Rin...she couldn't accept that and asked me to kill her but I couldn't. So she stepped in front my attack when I went to deal with our pursuers. She sacrificed herself to save the village.