That was a clear look of surprise on his face.

"Really? Well...this is a little strange." Not many people name their children just "Kid," after all, so meeting someone with either name or nickname was new for him. "But nevertheless, it's a pleasure to meet you, Kid."

...Yeah, that was still definitely awkward and strange for him, but he would get used to it eventually. Now he just had to be more alert and careful should someone addressed either of them without specifying.