Stunned, Watson can only watch with his jaw hanging as the mouse climbs up the body and seems to be inspecting the wounds?? He had to be hearing things.

"I'm hearing things," so says Captain Obvious. Oh no, was it the psychosomatic trauma again? Was the limp coming back? Steady, Watson old boy, steady.

"Did...did you just....talk?" He lowers his voice so the police nearby don't think he's crazy.

He is totally crazy to be talking to a mouse.