Similar to the Scholar Brendan dynamic event in Straits of Devastation, this dynamic event also seems to be bugged. The "Protect krewe leader Dobbs . . . " event followed by “Defend Rankor Ruins” are necessary to open up the Rankor Ruins WP in the Tyrian’s mount area of Timberline Falls. By doing so, the merchant Quinta becomes available for purchase of the karma Treasure Hunter item “Ancient Stone Summit Shoulder Spike.” I believe this has been bugged since the September Patch.
If someone, has found a way to circumvent this bug you support is appreciated. Please advise when this bug is anticipated to be fixed.