Ari is on vacation, taking a tour of America after a haul of unexpectedly invulnerable mahogany from a jungle dungeon left him and his coworkers unexpectedly flush. (DRT only get a small percentage, but a small percentage of a hundred million isn't chump change.) He's in Seattle when it happens.
It's a relatively normal dungeon entry experience: he's not in it, and then he is. The transition doesn't feel abrupt. It doesn't feel anything. He looks around, sort of slowly, and sees a pool of green liquid, and some sharp rocks, and he shouldn't touch those. He looks ahead and sees... the portal? It's not hidden or anything. It's maybe a dozen meters away, and there's another pool of green liquid but there's a walkway over it, he can just walk steady across it.
If you're in a dungeon and you see the portal and you can get to it, you take the portal. He'll have a funny story about how a dungeon kidnapped him and he wasn't even scared and it was a stupid baby dungeon and... it'll be funny.
His eyes feel like they're not quite opening right. But he walks, in a mostly straight line, towards the portal. And he gets down and sits on his butt and scoots across the walkway, to lower his center of gravity. Then he's at the portal, and he walks through, and he's back in Seattle, grey sky and claustrophobic buildings and all.
(He didn't float down or anything. ...he doesn't remember floating down or anything. Maybe he wasn't paying attention. He's having trouble paying attention.)