[At least Ren corrected himself on the mention of play, otherwise Shun probably would've given him a hiding right here. But that's his own error in assuming otherwise, he supposes, and he inclines his head.]

Good. I haven't seen an attitude like that before, so I wasn't sure how to read it. But as long as you're taking it seriously, it's fine.

[Maybe not as seriously as Shun takes it, but he still needs some degree of seriousness to teach someone decently. Still, he is right about at least one thing there, and even though the smile has faded, Shun looks rather satisfied.]

Knowing when to concede is fine, but knowing not to do it before the fight has even started is better. I can hardly argue with that view of it.