There is another scene in the chapter the trivia is more likely to refer to:
And stopped as Khedal blocked it, saving the ship. The impact rocked the ship, but the Goblin Lord’s eyes were locked on Khedal.
“[Until Death or Dishonor, I Challenge You].”
The Prince hissed. Greydath looked in his eyes and, finally, read his class.
[The Glorious Challenger].
And that does say he read his class