I also think I wouldn’t have understood his comments without MTG or at least having read Duncan’s explanation to the MTG color wheel.
(Nitpicking) Though I’d add that MTG doesn’t have a literal Blue Knight card either, so I doubt it’s that reference. (There are knights that are blue and green, but none with the exact names “Blue Knight” or “Green Knight”.)
I also think I wouldn’t have understood his comments without MTG or at least having read Duncan’s explanation to the MTG color wheel.
(Nitpicking) Though I’d add that MTG doesn’t have a literal Blue Knight card either, so I doubt it’s that reference. (There are knights that are blue and green, but none with the exact names “Blue Knight” or “Green Knight”.)
Also the Red Knight card is named “Blood Knight”.