... when I found Shirou in the Fuyuki Fire, he was almost gone. There was nothing left where I found him. The homes, the people...

[and for him, it has only been about five years since, less than three months since he last spoke to his Shirou of his childish dreams and hopes, leaving him with that.]

He was literally... the only person still alive I could find, but it was devastating for him. He had nightterrors for years after, none of which he would exactly remember...