Across the Wall

Alright I am a huge GW newb but I am on this quest, and when I leave ascelon city and head to that huge door with the lever above there is no way for me to be fast enough to hit the lever and get down to the door before it closes again...

What am I missing?

Thanks in advance,

And I am sure its something totally stupid I am forgetting, so please forgive me.

You need to party with another player to get out there...

GW is about teamplay, and that is one of the ways they show it.
And don't worry, you're not the first one to wonder about that