From a mage’s point of view, the most significant fragment was the largest one.
It was less of a fragment and more of an asteroid still in its original form.
Thia used all other asteroids as decoys as he sent this one in a different trajectory with concealment magecraft hiding it from sight and magical energy detection. It was set to fall on Snowfield.
Did he do it for the sole purpose of eliminating the girl Ayaka Sajou?
Or maybe he was planning to take down Enkidu indirectly, by destroying either their Master or the land the Holy Grail was rooted on?
The answer was yes for both, but while they were correct answers, they weren’t THE correct answer.
Don’t try to fool yourself. I hate the Holy Grail War. I hate this ritual and the guys who killed Flat for it. Humans... Human cities... Honestly, I quite liked London... But I don’t care about this city. ... Flat, there’s one thing I never told you about. The reason why you summoned that serial killer. That Heroic Spirit... couldn’t possibly be brought out by a toy knife. It was because of me. Because
I have the potential to be a serial killer for humanity... and I’m not anyone yet.
This inner monologue was just a fraction of a second in the real flow of time, done amidst the fluid movement of dropping this asteroid on Earth.
But it didn’t escape Enkidu’s Presence Detection.
The tactic of perfectly concealing its magical energy backfired. In this space Thia and Enkidu made so turbulent with magical energy, one neutral spot becomes too conspicuous to go unnoticed.
Enkidu stretched their chains in an attempt to apprehend the egg-like asteroid of magical energy but Thia followed up his magecraft to prevent that.
This resulted in the magical asteroid flying toward Earth almost intact, although Enkidu managed to shift its trajectory.
Instead of Snowfield, it went to the largest city on the West Coast, Los Angeles.
Goodbye, City of the Angels.
Goodbye, Long Beach.
Goodbye, Griffith Observatory.
Goodbye, Hollywood.
Once he finished calculating the mark of the magecraft he fired, Thia noticed Hollywood was there and felt sad about it, remembering it was a place Flat wanted to go to, while simultaneously canceling the sadness with resignation, as he didn’t care because there was no Flat in him anymore.
Direct contact with the malignant star’s destruction and atomic decay spells would return the city named after the angels to light.
The magical energy contained in it could erase all life within a few kilometers’ radius. And the decay that comes after the destruction would cause a chain of cataclysms by stimulating the land, the dragonveins, and the underground magma.
Not even Thia himself was able to stop this. This impact would define the future direction of humanity, on a physical level far beyond the arcane concealment.


Fate/Strange Fake: Volume 7, Chapter 21: "Beings Shaped in Man's Image"