.

1) you're neglecting the invulnerability period (sufficient time for others to arrive)

2) you're neglecting the portion about negating resets (making your example literally impossible under any condition)

3) you're neglecting how the mob is vulnerable to anyone during Tag-Immunity

4) assuming the troll is alone & tags/exits, the mob would hard-reset ("Tagger Buff" lost, Tag-Immunity undone) as it's enmity table would be nil

5) assuming the troll is in a mixed group & tags/exits, the mob would soft-reset ("Tagger Buff" kept, Tag-Immunity retained) & move to the next person on the enmity table (your party keeps their individual "Tagger Buff" despite the troll's actions, effectively meaning only the troll is getting screwed in this scenario of yours & nobody else)

5) you're neglecting the bit about how party members who contributed at all will earn fine (if not easy full) credit with it due to the contribution multiplier

6) you're neglecting the fact party members would be able to arrive in time practically anywhere in the world with absolute ease due to the invulnerability period/alternative party-teleport feature

7) a party wouldn't get less-than-full credit due to the troll's actions (which, as cited above, wouldn't take effect under this system), they just wouldn't be entitled to a nigh-guaranteed full credit in lieu of not being the Tagging Party... they'd have the same odds as anyone currently does nowadays (contribute as much as you can before the mob is dead)


Essentially, under this system, there is zero consequence to troll-behavior for anyone but to the troll themselves

The troll will only be trolling them self alone under this system

.