The auras which were coming toward Luna belonged to Anton and his butler who was also a rank 3 mage like him. Luna had made sure to apprehend all her enemies in a very short period of time to make sure that they would not be able to call for help, but still for some reason, two more rank 3 mages were coming to help him.
The reason behind this was actually quite simple. Mark was using a magic item to stay in continuous contact with Anton. So when Luna binded him, he was unable to continue giving mana to the magic item. So the connection between them was suddenly cut. That was why Anton was immediately able to understand that something bad had happened.
After getting closer to the room, Anton was about to enter the room but his butler stopped him. Instead he first launched an attack spell on the door and blew it away. If any kind of spell was engraved on the door then that would also be destroyed with this method.