Emperor Lu had reached the place where he heard about the presence of Long Chen. The thing was different, though. As he got there, he found out that Long Chen had flown away.
On asking where he went, he was told that Long Chen had flown in the direction of the Royal Palace.
Hearing that, the Emperor was able to guess. Most probably, Long Chen was going back on his own now that he had proven his innocence. He was going back to act smug and show off how everyone had done wrong to him.
"Fine, kid. Act smug all you want," the Emperor had muttered as he decided to go back to the Palace.
....
At the moment, he had reached the Royal Palace.
As he reached the entrance, he asked the guards who told him that Long Chen was waiting for him in the Royal Chambers.
....
Emperor Lu reached the throne room with his family.
As he reached there, the guards opened the room, making it easier for him to enter.