Join The Circle of the Unseen Hand. (If you decide not to join the Circle, you will be knocked out again and then ported back to Butcherblock Mountains. You must talk to Drarson McCale again to continue the quest.)
Go down the hall and talk to Nyran Dudez ( 25, 3, 49 ) /waypoint 25, 3, 49 further down the corridor in the hideout. (He offers the next quest in the line.)
Return to the entrance and click on the barrel along the west wall at ( 60, 1, -4 ) /waypoint 60, 1, -4.