Trevor's eyebrows twitched in frustration at David's comment, "You're one to talk."
It might have been true that Trevor did nothing to stop his friends from trampling over the second prince.
…but it wasn't exactly David's place to criticise Trevor either since he was also known to perform the actual bullying. Trevor was a bystander while David was an aggressor.
What tipped the scales here was the fact that Trevor claimed to be loyal to Arthur. On a normal day, David would have wanted to continue messing with his friend, Trevor.
But today was no normal day. David was stuck thinking about crucial matters concerning the second prince… and when he thought of how he used to treat him, it made his stomach turn.
The retainer triumph was shortlived as he gritted his teeth, "You make a good point… Is there something you want?"