Back in the caves just after Su had read her quest completion she felt a change in her body. It was like something blocked had been opened for her. The earth elemental mana that was lingering around them due to the shield and elemental spirits skills, was now hugging to her. "I can feel it. The earth mana. I can feel it all around me now." That was well beyond what Walker had expected.
He had thought that Su wouldn't notice much of a change and wouldn't be able to sense the earth elemental mana at all. However, she was describing the movement of the mana which was attracted to her due to the earth affinity she gained from the quest.
"Zenith, that wall over there by those stairs seem to be strange. Have you sketched them yet?" Walker purposefully distracted Zenith so that he could have a secret word with Su.