[ Gray wouldn't want to divulge anything Mordred wouldn't want divulged, so she'll keep mum about the Master bit. But she feels that she can at least say a little bit about her personal business. She picks at the blonde lock of hair above her left eye, figuring Rin will be curious about it sooner or later. ]

We were talking about this. Um, essentially it happened because of a rare incident, but I don't think it'll get any bigger.

[ Unless Rin feels like doing a Servant summoning at some point. Or god forbid, King Arthur shows up as a Servant someday. ]