"Maybe we should wish for something to see if it works." Kuroko looks like he's thinking for a moment before picking up the rat and staring at it.

"Do you know anything about this chalice?" Either he didn't notice or care about Midorima's discomfort because this rat was his friend and he didn't care about things like parasites.

In response, the rat just gave a loud squeak, jumping out of his hands onto Midorima, then off him and scrambling out into the bushes. "I would take that as a no."