Okay so this is exactly what happened.

Me and a friend went into someone's guildhall to check out their Training Hall and to also test out some weapons. At some point or another they closed their guild hall not knowing we were still in there, and became stuck. We could not port out to haven, our own guild or even leave through the door. Our guild chat vanished as well yet strangely whispers were still functional. After whispering a friend of said guild, they unlocked their Hall, and I was able to leave out their door. However when I tried leaving the actual guild, my screen went black and refused to load. I then X'ed out, and tried to log in again and I get as far as the knight selection screen before it just stops (the animation for the Knight still work but the music quiets down and is in a state of perpetual loading).

I just tried again and it is still doing the same thing.

Edit: Confirmed I'm somehow still online in guild list but not on friend list and "invisible" Going to see if I get afk kicked and hope.