After everything was ready, Roy and Sargeras found an empty area. Roy placed his hand on Sargeras's shoulder, opened the Void Eye on his chest, and began communicating with the Void Domain.
Then their figures flickered before completely disappearing. The entire process didn't even cause the slightest fluctuation.
After entering the quiet Void again, Roy was still fine, but Sargeras was extremely uncomfortable. When he got Roy to bring him into the Void, he was naturally on guard against him. So when he found that the surrounding environment wasn't right, he subconsciously wanted to attack him.
However, what made him feel strange was that he couldn't accurately mobilize all the energy in his body here. It wouldn't be an exaggeration to describe this strange sensation as stuttering. Furthermore, the dissipation of the energy in his body exceeded his imagination.