They Teleport immediately once they're out of the Forbiddance -
- arrive in what looks to be a Stoneshaped underground cavern, with (to arcane sight immediately visible even without any further analysis) an ongoing Permanent abjuration effect running over the whole visible cavern, and then they're moving forward, crossing another threshold of arcane-sight-visible Forbiddance, towards a heavy steel door that gets unlocked by inaudibly whispered magical password, and then they're inside a safehouse/cell with walls that look like iron and are no doubt at least 1 inch of iron. The wide-area Abjuration is running here too.
The steel door swings shut.
"At ease, Sevar," says the 7th-circle.