"No, you'll ruin your rifle, that way, old man."

“No, you’ll ruin your rifle, that way, old man.”
(a) Who is the speaker?
(b) What is the tone of the speaker?
© What does the word ’ ruin’ mean?

(a) Private Quelch, the ‘Professor’, is the speaker.
(b) He speaks in a snobbish tone, full of superiority.
© ‘Ruin’ means to destroy.