If The Key Fits

This quest is INSANELY frustrating if you attempt to do it the "right" way. If any of your NPCs die, you can't blow up the gate at the end (at least, having either the engineer or the lieutenant down means they will just stand there at the end and do nothing - not sure about the others). They will also run all over the place and aggro tons of mobs and get themselves killed, which forces you to run all the way back to the beginning of the quest and start over, and all the enemy mobs will respawn in the meantime.

The easy way around this is to fly up the mountain side and wait for your squad to follow you. If you pause every little while to let them follow you, they can climb all the way straight up the mountainside, and you can come down right at the gate and thus avoid all the frustration that this quest causes.

A long time ago when I was leveling through this area, I completed the 2 previous quests Easy Pickings and Precious Goods. I'm assuming that I picked this quest up and didn't complete it or something.

Anyway, I'm on my current adventure of trying to get Loremaster. I have returned to [npc=47592], and there is no quest to pick up from him. Only an option to click that says 'I'm ready to press up the canyon. Is the squad prepared?'. When I click that, I acquire the 5 Highbank NPCs that follow me. The quest says to take them to Grim Batol, so I do. I walk up the path making it all the way to the giant door with my 5 newly acquired friends. One of them sets his explosive charges on the door. An explosion occurs. However, the door doesn't explode, disappearing as it should.

So I just fly over the door and land on the ground. Killing more mobs along the way until I reach the small path that goes up to the dungeon Grim Batol, the 5 NPCs thank for me the help and then run up towards the dungeon and disappear. There are no quests here to acquire. So I fly back to [npc=47592]. No new quest from him either. I head back to the hill that goes toward Grim Batol, the [npc=47611] is supposed to give me the next quest Pressing Forward. But I do not see him.

There is some crazy bug going on here that even a GM can't assist with. "The issue you reported is either something we are not able to assist with, or we are unable to verify that all of the criteria were met. At this time, we are not able to assist with granting progress or completion."

I am at a complete loss.

Okay, I read all of these comments and still couldn't make any progress. But I finally figured it out.
After you accept the quest, the squad joins you. But you -have- to talk to Shaw again to tell him you are ready to leave and want the squad. If you leave without doing that, the team will still follow you and kill things, but not blow up the gate. I abandoned it, tried again, and discovered this 'secret.' After I did that, it was a simple walk up the canyon and they blew up the gate. Hope this helps someone!