Elite Skill Capture - Escape

In the Elite Skills thread, this is listed:

Escape (Talus Chute:Whuup Buumbuul[Troll])

However, I've cleared out Talus Chute twice and I never saw the Boss Whuup Buumbuul. Can anyone explain where in Talus Chute this boss is?

Any help is greatly appreciated

I thought I saw him in Snake Dance last night, but I didn't have another SoC (I'd already used the one I had) and didn't bother fighting him. I don't ever recall seeing him in Talus Chute, but it's a pretty big zone and the right boss isn't always up.

The troll boss I bumped into in Snake Dance last night was spamming Frozen Soil.

If you leave Forge, just head West and then south west. You'll find a cave with giants and trolls. He is in there. I've killed him 6 times before they changed the SoC trying to get it.

http://www.xennon.co.uk/eliteskills/

click boss name to see the map.