Sakura and Shirou
To Sakura's shock, the girl rejected her affection, instead beginning to tremble before screaming to be left alone, the ground shattering under some unknown force and sending pieces flying. Sakura felt small bits of concrete hit her body, reinforcing herself to reduce the damage but nevertheless bloodied as she jumped backwards, confused by the girl's actions.
Why is she doing this? Sakura thought, utterly confused but unwilling to leave a young, vulnerable girl having a super-powered temper tantrum alone.
Shirou, meanwhile, had noticed an odd shimmering and distortion in the air and, reflexively, had summoned up his twin swords, ready to defend himself if necessary. But, it appeared that the girl was just having a tantrum, so he quickly de-summoned the swords, dodging the flying debris as best as he could as he wondered what was going on. At the same time, he noticed a brown, furry blur that he assumed was Moko heading away at a great pace, clearly very frightened by what he'd seen.
Shirou and Sakura, too, felt frightened, but they refused to leave. The girl simply reminded Shirou too much of Illya for him to abandon her when she was so vulnerable. Even the temper tantrum was Illya-like.
The two of them pondered the situation as they tried their best to avoid harm from the flying debris with only limited success, wondering what had caused the sudden change in behaviour. She had been so friendly with them, then suddenly she'd just run away and, seemingly, wanted nothing to do with them.
What is wrong? All Shirou did was suggest she get her parents..., Sakura thought, suddenly realising the problem and then kicking herself for not noticing it sooner.
"Oh, I see...", she said, softly.
After all, Sakura had been abandoned by her parents and mistreated by those who had adopted her. She, too, had once hated the world and her former family. Even to this day she bore resentment towards her absent elder sister. Illya, too, had been seemingly abandoned and mistreated, and had reacted in the same way.
The signs were clear to see now she looked. The girl was just like she had been once, feeling like nothing could ever go right and pushing away those who tried to help, likely for their own good. Her powers, too, were surely something that unscrupulous people would take advantage of, just like Sakura's own magic had been appropriated by Zouken for his own ends.
Turning around, she could see a look of confusion on Shirou's face as he wondered what she meant.
"Senpai, she's lost her parents, that's why she was upset. And I don't think she's very well-treated by whoever adopted her. It's just like me and Illya", she said, a tear forming in her eye.
Then, without hesitation, she approached the girl again, ignoring any pain to wrap her in a hug.
"Please, we want to help you", she said, a tear in her eye.
Shirou, meanwhile, bowed apologetically.
"I..I'm sorry", he said, genuinely distraught. "I didn't realise...."