What do I do after "Defending the Rift"?

What do I do after the Defending the Rift quest in Abyssal Depths? Legionnaire Nazgrim jumped into the vortex and I am left alone on the ledge.


Solution 1:

You have to talk to the only person beside you and he'll send you in as well. If there is no quest giver beside you, it's caused you've run into a bug, some people here are saying you can swim away then back and he's there.