In the moment Azemo could only see the sisters as the entire group approached him. It wasn't that he didn't notice the travelers, but Bella and Ima took up all of his brain power.
He had planned to act cool in front of all of his new subjects and that plan went out the window as Azemo rushed the sisters.
In a second, Azemo was rolling around in the dirt with the companions who had been with him every step of the way since he left the demon stronghold. The only other time he had been apart from them for an extended period of time was the days Azemo spent in the dungeon.
Still, it felt as if he had been apart from the sisters for much longer than a few months and Azemo was too happy to think straight.
There was also relief mixed into the excitement. Even though he could tell that they did not die, Azemo did not know what the sisters had gone through in the battle for the human capital.