It was always, "Let me show you, fellow," or, "No you'll ruin your rifle, that way, old man."

It was always, “Let me show you, fellow,” or, “No you’ll ruin your rifle, that way, old man.”
(a) Who is the speaker of the sentences inside quotation marks?
(b) What does this statement imply?
© Which word in the extract is a synonym of ‘friend’?

(a) The ‘Professor’ is the speaker of these sentences.
(b) This statement implies that the Professor possessed vast knowledge of military equipment.
© The word is ‘fellow’.