"Let the Fires Come!"

Seems ridiculous after 9.0 patch. I did this in Brill with about 4 others spamming water the entire time, we only managed to put out 1 of 3 buildings. Even when you put a fire node out, it respawns fairly quickly and will continue to do so until every node on the building is out.

For you lone wolves in the horde:

It's entirely possible to solo this quest in Falconwing Square (in Eversong Woods). The key is to start dousing the flames from the trainer building (not the inn) first and fast, since it's farther away from the water barrel than the inn. Don't forget that the Headless Horseman starts the fires in two waves (in this order for example: building #1, building #2, building #1, building #2).

I concentrated my water buckets on one location only and if the other flames started to spread around (i.e. they grow large), I threw one water bucket at them and resumed on concentrating my water buckets at that one location. There's probably a better tactic for this but this one worked for me.

Once you're done with the other building (can take a few tries if you're unlucky or if you screwed up), start dousing the flames from the inn. It's a lot closer to the water barrel, so dousing it's flames should be a piece of cake, even if it's on full fire.

I recommend movement enhancing skills/talents/items/enchants (Swiftness Potions perhaps?) if you try to solo this, they make it a lot easier.

This quest is f-king broken - at least in Brill.

I found an easy way of completing this if you are horde.
While you are at elwynn forest to douse the alliance wickerman , mount up and fly over goldshire , stand there for 15 minutes and let the alliance complete this for you :)
you will get credit even if you do nothing way up in the air , just make sure you have the quest in log.

To get to Elwynn fast , take the quest to drop bombs in SW , and as soon as you are in SW on the broom - log out and in , you will appear in Elwynn forest