[Sakura actually looks sad now.] I summoned her, and I was supposed to fight on behalf of the Matou family... [She hesitates. She doesn't want to name names here; she doesn't want him to be wary of Shirou, and it probably wouldn't help if he knew Rin was a Master as well.] But there were people I didn't want to fight, so... I gave up my rights as a Master.
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[Sakura actually looks sad now.] I summoned her, and I was supposed to fight on behalf of the Matou family... [She hesitates. She doesn't want to name names here; she doesn't want him to be wary of Shirou, and it probably wouldn't help if he knew Rin was a Master as well.] But there were people I didn't want to fight, so... I gave up my rights as a Master.