nger (Avenger)
In the end, Luo Zhen still didn't let Artoria [Alter] have her way and dealt with Joan of Arc [Alter].
The reason was simple.
"Back in the First Singularity, she helped us too. Just for that alone, I ought to repay her kindness."
That was Luo Zhen's reason, and it was Mashu's thought as well.
In the France of the First Singularity, Joan of Arc [Alter] had indeed completely ravaged France through her hatred, even threatening Luo Zhen and the others for a time. But in the end, Leff had taken her "Holy Grail" away. When she was on the verge of death, she had joined forces with Luo Zhen and the others to avenge that grudge, using her Noble Phantasm to burn Leff Lenore Flauros, who had transformed into a Demon God Pillar. Only then had Luo Zhen and the others won.
Without Joan of Arc [Alter], Luo Zhen and the others would absolutely have been unable to defeat the Demon God Pillar with the strength they had at the time.
Even if Joan of Arc [Alter] hadn't been trying to save everyone and had instead been seeking revenge on Leff, Luo Zhen had still been able to repair the First Singularity and lay the foundation for Human Order in France because of her.
Therefore, even just for that reason, Luo Zhen would never stand by and watch Joan of Arc [Alter] be killed right in front of him, much less killed by a Servant with whom he had formed a temporary contract.
Mashu thought the same way.
"Miss Joan once fought alongside me. I can't just watch her be killed in front of me."
That was why Mashu stopped Artoria [Alter].
Although the people of Chaldea were wary of Joan of Arc [Alter]'s existence—for she had