I know it's light refraction.

She took her eyes off Jane for the moment, stepping down the last few steps until Raven was stood at the bottom of the staircase. That was as far as she was getting for now but at least it was slightly better than still being on the stairs )

What, you're checking how light refracts on puppies? Pretty sure creating a prism out of them isn't the same, but I'm not a scientist.

( Just a wise cracking mechanic. A hungry one )