Irving didn't know what happened. For some reason, Levas had yet to appear.
What if Selena realized everything was just a trap? Did she ask someone to help her? She wanted them to eliminate Levas and let her personally take her revenge?
On the other hand, Selena knew that no girls helped him. Even with people like Alavenya, she didn't ask for the Dragon King's help. That was why all the people remained in the city.
As a result, Irving believed Selena had completely fallen into their trap. Everyone who was strong enough to help her remained in this city. Hence, she shouldn't have any other helper. Even the principal was still in the academy.
However, there was one miscalculation on his part. That was Nathan.
Irving didn't know Nathan had joined the Sleeping Garden. And that connection allowed him to become Selena's support.