Lumberjacked (25 player)

SO frustrating.... I cleared the area, went and killed the boss in preparation to kill these 3 guys...... but they despawn as soon as you down the boss! No one else has mentioned this on this page... don't do what I did :(

and now for somthing compleatly different:

The Lumberjack Song by Monty Python

I'm a lumberjack, and I'm okay.
I sleep all night and I work all day.

MOUNTIES:
He's a lumberjack, and he's okay.
He sleeps all night and he works all day.
BARBER:
I cut down trees. I eat my lunch.
I go to the lavatree.
On Wednesdays I go shoppin'
And have buttered scones for tea.
MOUNTIES:
He cuts down trees. He eats his lunch.
He goes to the lavatree.
On Wednesdays he goes shoppin'
And has buttered scones for tea.
He's a lumberjack, and he's okay.
He sleeps all night and he works all day.
BARBER:
I cut down trees. I skip and jump.
I like to press wild flowers.
I put on women's clothing
And hang around in bars.
MOUNTIES:
He cuts down trees. He skips and jumps.
He likes to press wild flowers.
He puts on women's clothing
And hangs around in bars?
He's a lumberjack, and he's okay.
He sleeps all night and he works all day.
BARBER:
I cut down trees. I wear high heels,
Suspendies, and a bra.
I wish I'd been a girlie,
Just like my dear Papa.
MOUNTIES:
He cuts down trees. He wears high heels,
Suspendies, and a bra?
[talking]
What's this? Wants to be a girlie? Oh, My!
And I thought you were so rugged! Poofter!
[singing]
He's a lumberjack, and he's okay.
He sleeps all night and he works all day.
He's a lumberjack, and he's okaaaaay.
He sleeps all night and he works all day.

I soloed this achievement on my frost mage. Cleared out all the area (but the boss, of course), then mounted up and aggroed Stonebark, Ironbranch and went running to Brightleaf. I waited for them two to arrive there, then ding. Success. =)