"Do you have a significant advantage?"
Noland Lee used "Mind View" to locate the Shadow Deathers who were secretly observing him.
He heard a part of their conversation and used Deconstruction to obtain their panel and memory fragments.
The Shadow Deathers, situated in the Dark Zone, also mastered detection spells adapted to the environment.
If Noland Lee didn't have Mental Magic at his disposal, he estimated it would have been very difficult to locate them.
In that sense, the Shadow Deathers' claim "We have a significant advantage" was indeed accurate.
But what they could never have anticipated was that Noland Lee had already figured them out.
The language used by the Shadow Deathers was the common language within their domain, not the Ulnas Ring Common Language.
The Deconstruction Results included Level 5 "Shadow Death Watchers' Linguistics," so there was no language barrier.
The six Shadow Deathers covertly watching Noland Lee revealed their disguises.