Sakura
Sakura held onto the silverware for dear life, as if they were one of the only things she could link to reality at the moment. Everything had gone dark, the light vanishing rapidly from her eyes, as she tumbled helplessly down a never-ending pit she sped up, faster and faster falling deeper and deeper. However, the entire time, she was focusing on something important. The action of keeping her legs perfectly extended, in a standing position. It was vitally important, because she knew this couldn't possibly be real. Rider was still talking to her, she still was holding the silver in a vice-grip, so she had to still physically be in the kitchen.
And she didn't want to ruin their perfectly normal breakfast. She didn't want to do this. If she stood still and waited for it to pass, it would all be fine. Even if her legs started to feel heavy and burn, she would stand perfectly still. That way nobody would notice…
Shirou
Shirou had been loitering around the kitchen and dining room for a time, just aimlessly pacing while he waited for Sakura and Rider do their thing. But while he was doing his rounds, he'd noticed something about Sakura'd looked really, really off. She was just…standing perfectly still, holding a mass of forks knives and spoons in her hands, just standing there, and Rider looked like she was hiding something. The Rider he knew well hadn't made that face in years now.
Anyway, he decided to go in and check it out. He wanted to respect her privacy, however… she looked really really off. He couldn't quite shake off the feeling that something was going terribly terribly wrong in her head. Like what had happened last night. He trusted her. She wouldn't hurt him, the same way he'd never hurt her. So he took a deep breath, dragged a chair over and put it behind Sakura, sitting in it and gently pulling her into his lap. She gasped and tried to resist, still attempting to hold her upright posture, but he whispered soft words into her ear, like one might a baby, and held her in his lap gently but firmly with an iron grip, easily overpowering her and holding her relatively still.
As she sat in his lap and struggled furiously, he turned to Rider. "What's happening to her? Can she hear you?"