First of all there's another method i guess (http://www.mmowned.com/forums/world-...bethtilac.html) but this one is different and soloable.
we all know last thrash pack going before Bethilac is pain in the ass if your group is not decent.
anyways here are the steps.
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1- Jump this ramp.
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2- Jump to the stone there.
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3- Land to the boss's area.
I hope this was helpful.