[Bumamgar]

I never had GMs enforce any sort of leapfrogging rules for single named (ie: trash clearing in Fear or clearing down to the Royals in Chardok, etc). There were only two cases on EMarr where there were leapfrogging standards that were upheld by GMs: NToV in Velious and Vex Thal in Luclin. In both cases there was a "key mob" that once killed was considered claim to the rest of the wing/zone. For NToV it was Aary, and for VT it was Blob 1.

To avoid getting leapfrogged on single mobs guilds developed strategies to minimize the risk of being leapfrogged. For example, instead of clearing down to the royals, a common tactic was to pull them to the zoneline. Other tactics involved training away the trash so that the raid could move in to the main target without clearing, etc.