He needed some time to set up the grand array. Besides, if Ao Feng really broke in to cause trouble, he probably wouldn't be able to hold out for very long even with the array in place. What's more, Ao Feng had only given him half an hour. He had to completely clear the toxins from the Dragon King's body within half an hour, or he would be facing a massive battle.
Of course, Yun Chen was not without a backup plan, but it wasn't meant for dealing with Ao Feng.
If the Silver Dragon Clan didn't have the Myriad Dragon Grand Array, Yun Chen wouldn't have taken Ao Feng seriously at all.
Chapter 580