[Mikey just listens until he's asked that question, shrugging lightly as he would do if Donnie just asked him why he was still talking some science mumbo-jumbo at him.]

You were probably telling me because I'm friendly. I mean... I kind of do my best to be friendly with everyone. And... it's not like I'd tell anyone if you wanted to keep it a secret. I'm good at not talking about things.

[He's neither pressuring Kaiman to keep talking, nor is he trying to tell him he should stop.]