When the Tribunal Fleet returned to Earth, they had already destroyed the elite Ursus Star System and the Domusac Star System where the Ghost-faced Beasts resided.
Of course, the reason they did this was simple; for Duanmu Huai, having come so far, what was the difference between destroying one or two star systems?
On their way back, Duanmu Huai had made a detour to Ring 05 and blown it into pieces. He knew that a Corpse Brain Beast was sealed in the Ring 05, which was supposed to be released only when the idiots from the Star Alliance sent people for investigation. However, too lazy to play along with the plot, Duanmu Huai obliterated the entire Ring along with the Corpse Brain Beast in space.