"I see, I completely understand now."
In Blind Town, in a lightless hotel room, two identical girls were engaged in a spiritual exchange—these were indeed the reflections Weiser and the Illusion Mirror Dragon created from parallel world lines.
With the Mutual Love Technique Spirit, Weiser had created a little Miracle called "Mutual Love," allowing a rapid information exchange between two souls. However, this Miracle had a major side effect: their personalities and memories were likely to become confused. Yet, for Weiser and the Phantom, this side effect was almost negligible since the Phantom was just Weiser's shadow.
After acquiring all the magic knowledge from the other, Weiser felt her Spirit Faction was virtually touching the threshold of the Holy Domain. She looked sincerely at the Phantom in the darkness and said, "Thank you."
"No trouble, I am the one benefiting the most," the Phantom replied. "If there's nothing else, I'll be heading back."