Rider
Before Rider could even begin to explain her viewpoint, Shirou jumped in and interrupted her.
“No, of course you didn’t, and you know why? Because she hates bringing it up, she’s never told me why. The only reason I know is because I sleep in the same bed as her", he said, obviously exasperated and very worried. “She never tells anyone about her problems, she does her damndest to hide them and pretend everything’s ok!”
Then, grabbing hold of Rider's shoulder, he continued.
“If it’s bad enough for her to tell us, it’s something really really bad, Rider!” he finished, a look of panic in his eyes.
Rider sighed. It was obvious that Shirou was extremely worried about Sakura and, honestly, she couldn't blame him one bit for that. In fact, she herself was extremely worried. The way Sakura had acted earlier was not something she had ever seen before. Further, even before that, Sakura had been acting in a manner that Rider had found very disturbing. Her desire to "protect" "Brown Senpai", for example, even to the point of kidnapping him if he did not come willingly. She could tell that Sakura was extremely fragile right now.
At the same time, though, whilst Shirou did have a point, the way he was acting was certainly not helpful. Rider didn't know what, aside from time, could make Sakura better, but she knew that displays like this from Shirou would most definitely make her worse. She needed to calm him down somehow, to reassure him that things would be OK.
"Shirou", she said, softly, "I know that it's bad. But, I was with her before you arrived, and I can assure you that she is better now than she was then. Faust was important to her sanity, but he was also a very bad influence on her. I know that her problems won't just disappear, but they will improve as long as we are here to support her. I know that's not really enough, but I don't know what else we can do."
"Most of all, though, you need to remain calm. If she sees you acting like this, then it will make her worry, and that would be bad. I too am very concerned about her, but we cannot allow our concerns to make things worse for her."