Then there you have it.

[She remembers hearing a couple chatting in her memory, after spending the night in the park. The date came up in their simple banter.]

I received a memory last week that took place on February 11th, and Emiya-kun was perfectly fine.

[...okay, so he wasn't fine, but Sakura doesn't need to know that. Shirou had a serious injury; she remembers herself in the memory berating him for coming after her for it, with such a wound.

But how he got it, she can't remember. Was it Sakura...?]