a little background: in the story Momo and Yukio are students of a very sophisticated type of magic called wordcasting where words and ideas have a magical... sort of... effect... it's really hard to describe what it's like. those proficient in wordcasting often go on to become negotiators or ambassadors or things like that where they use their skills. A wordcasting duel is usually a psychologically ferocious battle of wits

Anyway Yukio is usually pretty mediocre at it but something clicks with him and momo where he can cast to momo with natural ease... sometimes this is good and sometimes it puts a strain on their relationship

Here is momo going all EoE-Shinji mode and yukio calmly casting to try and snap him out of it