Oh no- crying? Well, there's no actual crying of course, but it takes a certain level of emotion to want to cry.

Enough that it has her attention anyway. Rex explaining what the word 'antagonistic' is only a brief distraction as well- "Mnh...I think it does," she says in response to the other's question, quietly logging the word's meaning away.

She takes a moment to pause- think about what she wants to ask, exactly. But after a moment she determines it can't be held quiet. 'Moon' falls into her lap just in time for her to speak.

"...Is it... ...hurting now?"

Is that why he was upset, perhaps?