Funny story - Thalemar, a priest that Noor knows on the Maiev realm (and managed to grind out the schematic for the Arcanite Dragonling, which nobody seemed to know on that low population server), was transferring to another realm with some friends of his. Turns out he's going to The Venture Co. realm, which is where Reinisch is! So I finally decided to get a portal to Shattrath and set Reinisch's hearth there, so he can run into Thalemar sometime.
In portalling back to Thunder Bluff, I found a quest I had overlooked - Serpentbloom. That also lead to two other quests, the Report to Splintertree Post quest and the followup scout reports in Ashenvale and the The Essence of Aku'Mai quest in Blackfathom Deeps. I tried collecting the essences a couple of times using target dummies, but the sirens with their ranged frostbolts would go after me instead of the dummy. I had decided to skip the quest for now on my second corpse run back, but then I noticed all the mobs were dead. I gathered up some essences and saw that a ?? NE hunter had cleared a lot of the area, so I was able to finish this quest after all.