Even when they were at their strongest, they had only managed to attack the Golden Bull continent. They hadn't been able to force the Protoss to the point of fortificating their defenses and clearing out the wilderness. However, Zhao Hai had done it. This also showed Zhao Hai's strength from another aspect.
It was because of this that Edna and the others had a heavy look on their faces. They knew that what Zhao Hai and the others said was true. They had indeed launched a counterattack on the Protoss continent. In other words, the aliens on the ark continent had the power to be on equal footing with them. They would definitely be unhappy with the attitude they had used against them.
However, they still wanted to see how Zhao Hai would attack holy light City. They had noticed that the walls of holy light City had disappeared.