[You know, now that you mention it Mike does not the lack of apparent irritation from Raph with regards to his choice of mask color. So much so that his attention is instantly diverted from Leo back to Raph, who has earned his very own single brow-ridge look of impressed astonishment.

He's still looking at Raph when he begins to answer Leo.]

Curiosity. I mean, I knew right away that you weren't from my world, so I figure that frees me up from the ol' cloak and dagger routine.

[He half shrugs.]

I mean...isn't the better question why the heck are the two of you meeting out here?