A written guide:
http://leadexample.net/guides/gw2-article/slothasor
Video guide:
https://www.youtube.com/watch?v=hKBJdICQZvQ
Wooden Potatoes also has a video guide, however his runs 30 minutes.
https://www.youtube.com/watch?v=NVxxkhEEI1Y
I have never done this one--- looks like a fun fight. I'll probably use my dagger/focus tempest which Wooden Potatoes says worked well in his group.