there are alot of quests like this that give OP assist NPCs, back in MOP when i made this player alot of twinks would PVP in redridge mountains this area was a hot spot till BFA kill world PVP along with scaling of quest zones. i was on this quest
https://www.wowhead.com/quest=26713/showdown-at-stonewatch that gives you 5 NPCs, they heal, dot, smash, etc. i was on the quest when three 10s showed at stonewatch and tried to gank me, they came close but the NPCs wiped them. i decided not to do the quest and have kept it for a decade.
i would occasionally log to see if ganking was going on, several grouped 10's had a tactic at times to PVP right near this GY where they got free no penalty res's. so even if they died to a like level 30ish player they would res fresh and kill the near death higher level and gain honor points. with my NPCs and playing disco i was able to survive these attempts and at one point they would log
there are some spots with fast mob respawns i could park and get the DMF kill quest done AFK. i did help some level abit by having them stand at my player while grouped. still works to this day
at the start of SL players were staying in the maw and using the quest NPCs to attack the elites in outer areas which blizzard intended to keep players on the questing path rails
in mechagon when you do the other side quest, after you do all the quests you can stay inside, the NPC that assisted you will stay with you even after quest turn in and can 1-2 shot everything