Yeah... When they disappear from this world it means they went back to their own world. You can usually tell if someone is gone either because their name appears on this wall of names. Everyone who has come here and left has a name on that wall.

[ He pauses for a moment, taking in a soft breath before speaking up again ]

Ah, but... if they leave an amulet behind, it means they will come back here. No one who has left an amulet stayed away for long.

[ He started fiddling with the amulets in his hands now. Without realizing it he was thinking a bit too hard and she might hear a soft comment of: Maybe I should connect their amulets? So they're together when they come back... ]