Don't sound so surprised, Arthur, ain't you the best swordsman o' your time? Sure it ain't too surprisin' someone'd want to learn from the best.
[And, right, he had options.] Which one'd you recommend?
[Arthur probably knows better, anyway. Personally, Bucky thinks it'd probably be boring, giving pointers to someone who barely knows how to hold a sword... but, hey, Arthur, do your thing. He's in your capable hands for this.]