No option for additional recruitment in dungeon when someone leaves

[YuniYasha]

Was running The Lost City of Amdapor when our tank disconnected. Roughly 30 seconds after he disconnected, he was removed from the party. Usually when someone disconnects, you have to wait a few minutes before you have an option to remove them, but this guy was removed from the party automatically after 30 seconds or so. And the odd thing was, no one in the party got a popup for additional recruitment. The Duty Finder window did not have an option to recruit new members. WE were stuck in the dungeon tankless, and we had no choice but to abandon the dungeon.