Hiro didn't take the flying demon to the Valdmor Stronghold, but he abandoned it after crossing a certain distance.
He was unsure if they had any aerial surveillance around the stronghold, so he would rather synchronize with his Arcana Lord character and constantly teleport over.
Taking his experience with Asmir as an example, Hiro didn't sneak into the stronghold this time around.
Instead, he landed in the barren valley that wasn't too far or too close from the stronghold.
Then, he bought new cosmetics to change his appearance, even if by a little. As he wasn't sure about the activities of traitors in the Demon Tower, he made slight yet obvious adjustments.
He removed the crimson horns and exchanged them for a pair of black wings, fluffy and full.
His hair color was also changed to black, the same with his eyes. Like this, even if information about his appearance were to spread back, no one would know of his infiltration.