I know I've been through this before, worrying about the various permutations of irradiated creatures, which one would be able to vanquish the other, whether the amount of atomic power would have to be greater to compensate for size and inherent skills, and so on. It's pointless to dwell on it too much.

Just as it's pointless to wave in a flying mouse on an aircraft carrier, as if he requires a length of flat surface to stop.

Just as it's pointless to wonder why there's a reflection of a window on Atomic Mouse's forehead.