When Anthony first touched the door handle, he sensed something was off. It wasn't just a Demon Spirit, but a very cunning creature. Although it disguised itself well, Anthony still noticed.
Even though he didn't know exactly what was wrong at the time, Anthony just felt it was off, so he didn't go back to the boundary immediately, but instead left it hanging for a while to gather more information.
The door handle, on the surface, cooperated well, providing compensation swiftly each time, but Anthony was too familiar with these tricks. He wanted to see what game it was playing.
Sure enough, the trap was hidden within the compensation; once the airship entered, it couldn't leave.
Actually, Anthony had been in once before, but the first time he entered by himself, it was smooth going in and out. So he borrowed dozens of skeletons from Ange, finally triggering the trap.
