The portal’s path sucked this character in and then dumped her in Baalberith’s office, rather than pulling her all the way through to one of the ends. More evidence that you shouldn’t mess with portals.
Essentially, the path of the portal was “yanked” straight, undoing the twists caused when Sett and the others accidentally diverted it. But someone has gotten caught in the process….
Baalberith: What? There’s nobody on my schedule right now. Who are you?
Someone: This is Hell, isn’t it?
Baalberith: You catch on quick.
Someone: I’m not supposed to be here…
Baalberith: That’s what they all say.