Because He Is Emiya Shirou

In the Light Screen footage, Red A's "patient guidance" involuntarily prompted Tohsaka Rin to start thinking things through herself.

Or rather, at the very least, in front of Red A, Tohsaka Rin had to present herself as an outstanding Master—and actually demonstrate it.

So, when time returned to that afternoon after school, when Emiya Shirou came looking for Tohsaka Rin, she displayed an openly hostile attitude.

The school happened to be empty already. Seeing that Emiya Shirou still failed to grasp her "deeper meaning," she attacked him—raising her right hand in the shape of a gun, then firing black magical bullets with a BIU BIU BIU.

However, her accuracy needed work. Every shot was an outline shot; not one of them hit.

Of course, everyone in the real world who understood the girl's personality believed she had deliberately missed.

Then, startled, Emiya Shirou hurriedly ducked behind a wall and asked Tohsaka Rin what she was doing.

Tohsaka Rin's answer was simple: she said she could no longer stand Emiya Shirou's attitude of not taking the Holy Grail War seriously, and had decided to use practical action to show him just how brutal the struggles between magi could be.

Hearing such words from Tohsaka Rin felt truly strange and subtle.

However, this in turn made people think of someone else—another master and apprentice pair.

They were Kayneth and Waver.

Back in the Light Screen footage of the Fourth Holy Grail War, Waver had known nothing of the Holy Grail War's brutality and behaved with great inexperience. Kayneth had then coldly declared that he would let Waver understand the brutality of struggles between magi.

Now, this scene was practically a new cycle, except the people experiencing it had changed.

Next came the scene of Tohsaka Rin chasing after Emiya Shirou and attacking