Hm. Do you mean to say that these Rathmores had spells to remove others' magic?

[ that puts an entirely different perspective on what apparently happened. ]

To cut to the heart of the matter, I still have not learned why they committed this grave offense. It seems I missed some manner of hostilities between the natives here and the Mirrorbound, yet the assumption seems to be that this violence is a matter of the past.

[ well, no one has explicitly said so, but Enkidu and others have explicitly tried to urge Gilgamesh away from holding onto a vengeful attitude, which would include assuming the worst of any other natives. ]