She didn't know if he was lying or telling the truth. Saying that they wanted to take down the 『Dragon God』, second of Seven Major World Powers, could be seen as nothing but a joke. However, the Sword God had a confident expression, and Eris was making a face like it was natural, and together they had a strange persuasiveness to them.
Additionally, Reyda thought nothing except that it'd be interesting if they did it for real.