The double door of the lobby is no more, mainly because Evelyn has destroyed it during the fight with Ezekiel. With the door gone, it reveals the world outside of the castle to Nico, showing the thousands of devil knights kneeling at him just outside of the castle. With flags of the Underworld kingdom being lifted, the thousand army of red-armored devil knights patiently awaits their king's command.
Nico paid his army no more than a single second of gaze before turning it to the people beside the exit. Standing just by the destroyed door is a pair of individuals that Nico knows very well. Evelyn has brought the person Nico was looking for, the General of the Devil Knights.