As he finished taking in the situation through his divine sense, Xuan Hao realized that he might be able to break the formation before his soul imprint ran out of strength by forcing the formation to use whatever power it still had left flowing in its system on fighting him. Even if his avatar ended up being destroyed in the end, if he could force the formation to reach a point where it was no longer able to keep operating normally, the group of people who were huddling together with his disciple should be able to find a hole in the formation that they could escape through.
The reason why he felt confident in this group of strangers being able to do something like that was because he had long since realized that all of them seemed to be skilled in the Dao of Formations. The formation they constructed using themselves as formation nodes to resist the flying sword being a rather obvious sign of their skill when it came to the Dao of Formations.
Rumble~