He knows that Senku dislikes killing, not quite to the extent of a kirin but more so than most humans. And so his heart hurts for him even on top of the amount of pain it was already filled with.

He just looked at the scene for a moment and then began walking. "I am unsure how well our SCA's are working, so I hope it still translates well enough for you to understand the writing of my world."

Then again he didn't necessarily need to understand to copy.