Ghostlands: Missing RP (Deliver the Plans to An'telas)
quest=9166
Once the quest is finished, there is some RP supposed to happen.
1.) When you turn the quest in, Magister Sylastor (npc=16237) will say: "Look out... the night elves are back!" and point his finger in their direction
2.) Two level 15 Night Elf Ambushers (npc=16238) will spawn on a nearby hill and head towards the guards and engage combat once close enough
3.) Once the ambushers are close to the guards they will dismount and attack while one of the ambushers will say: "You won't get away this time"
4.) Once the ambushers are dead, Magister will say "Thank you very much! I don't know what I would have done if you weren't here!"
There are no videos from pre-cata, however all comments on appropriate quest and NPC pages on wowhead state that everything happens exactly as shown in this video: