The phase you should be in after getting the buff (The one that allows you to see Dormus) seems to be bugged. I was at the Steam Pools, I had the buff but I hadn't killed Dormus yet because I was waiting for a friend to come (he was in a party with me) so that I could trade it with him. Then one *#@%$! (fill in the word yourself xD) came by and killed it. Even though I had the buff and he most certainly did not. Luckily I already have the title and mount but I found this action pathetic, rude, childish and just a very low thing to do.
See here the screenshot I made whilst the guy was just done killing it:

So watch out because you never know what kind of pathetic person might be flying by.
P.s. This is on Frostwolf.