Eris was the same as always. Normally, even if she participated in study sessions at the word of the Sword God, she didn't voice her own opinions.
What Eris recalled at those times was the distant past: the times when she studied swordsmanship together with Rudeus. In those days, she had done this kind of thing as well with Rudeus, they discussed this and that, and various ideas popped up as well. It was something that Rudeus did. Though it was for this kind of simple and easily understood reason, to Eris it was an extremely important reason, and made her communicate with others.