Red's team was in the middle of nowhere. They were essentially just in a random spot between different Planets. This was the place where Kyle would become an Immortal.
According to Abyssal Depths, this spot was well outside the range of the Protector's perception. She didn't know why Kyle didn't want to advance near the Protected City, but she also knew that it wasn't her place to ask. They were just loose acquaintances. Keeping secrets was normal.
Sebastian had already become an Immortal. Compared to Kyle, he didn't need to keep his advancement secret. Sure, he still had more Energy than he should have since he had two Weapon Avatars as well, but his advancement wouldn't be too strange. At most, the Lord would become a bit interested and look at him. Luckily, Sebastian's aura wasn't unnatural.
