Benjamin had no doubt that the border patrol had set up sensing methods. But, with a distance of more than a hundred meters between them, even if flying can cause magical disturbances, they will have difficulty sensing it. Added to the fact that it was pitch black, they would be impossible to spot with the naked eye.
"Does this world have a telescope?" Benjamin suddenly asked himself.
"It is not even something that is high tech, even if this was an ancient world, it has already been invented." The System said matter of factly.
"...Why didn’t you say something sooner."
The System’s attitude was the same as always, "You did not ask."
Benjamin was speechless.
After giving it a lot of thought, he said to the other mages, "We should fly just a little higher, to avoid being noticed by the people below us."