Besides not wanting to interfere unless others were trying to pull on some nasty tricks, Daimon also wanted to use this time to try and focus mana on his eyes to see if maybe he could decipher some of the functions of the array that was engraved on the ceiling of this castle.
His Black Sea Emblem which also helped him through Daphne's challenge, brought him here after all, so there must something he can gain from this challenge, besides helping a teammate if the need arises, just like it happened with the Valas princess.
Speaking of which, the moment Daimon entered the room his instincts urged him to try something, but he kept himself from doing so, because if he did, he will for sure be discovered by the guy that is observing this whole charade with disdain from above, inside of that skybox.