:) "Ya whol, mine herring" if I am not mistaken is a joke since in German he should have said "Ja wohl, mein Herr" or "Yes, sir"...and what he actually says is "Yes, my herring" (!) but I think Roni is the expert in that department.:):)
you got it right.
Buk maybe had an even more musical idea: to say "herring" sounds more similar to "Herren" than to "Herr", which means, it's a plural-form.
Stupid when he talks to only one person. yes. But - there's an old german song with that title "!" - the Nazi-doc would sure know that song. how about Buk?