Thank you. Thank you. Thank you.

Thanks a lot. Very kind of you.

http://www.wowhead.com/quest=12807
The NPC (Lord-Commander Arete) don't tell the story.
Thanks, again.

http://www.wowhead.com/quest=12949
The NPC ( Instructor Hroegar) who gives the key is not attackable.
Thanks for your help.

http://www.wowhead.com/quest=13386

The Captain Kendall is not available. I used /tar and I found that he is underground. I can target him, but I can't speak to him.
Thanks for your help.

http://www.wowhead.com/quest=13213

I can't speak to Geirvif. There's another post about http://www.wowhead.com/quest=13216 (Battle at Valhalas: The Return of Sigrid Iceborn). May be I must wait for a restart????
Thanks in advance.