Regarding Xuanzang Sanzang's words in the Light Screen footage, Mordred naturally assumed that the two of them had been summoned together at some point in the past and fought as opponents.
Perhaps in a Holy Grail War or something similar.
It was simply that Mordred had not inherited the relevant memories, while Xuanzang Sanzang, though she did not possess clear memories either, had engraved the memory of that battle into her Heroic Spirit Saint Graph, allowing her to bring it along this time.
Xuanzang Sanzang offered no further explanation. After hearing Mordred's words, she understood that there was no room for reconciliation between them. All Mordred desired now was to die for the Lion King; nothing else mattered, no matter how much was said.
Likewise, Xuanzang Sanzang had followed her own will to reach this point. She believed the Lion King was wrong, and so Fujimaru Tachibana and the others choosing to stop the Lion King naturally meant they were in the right.
Moreover, Fujimaru Tachibana gave Xuanzang Sanzang hope for saving Human Order.
Even if that hope was incredibly faint, it was still hope.
For that hope, Xuanzang Sanzang was willing to stake everything she had.
The two, each fighting for their own convictions, clashed once more!
Then, the view shifted again, returning to Fujimaru Tachibana's side.
Looking at the pillar of light, Fujimaru Tachibana knew they had to stop the Lion King. Otherwise, once the divine punishment descended, they would all be finished—there would be no talk of saving Human Order then.
After all, Ramses II's meaning had been perfectly clear: this attack from the Lion King would be unprecedented and unparalleled, a true Light of Purification capable of wiping out every living thing in the entire Singularity with one strike.
Such might was undoubtedly the true light