Jing Yan did not use the Void Flame Secret Technique!
To kill Deng Qing, he didn't need to reveal all his tricks.
In fact, if Jing Yan wasn't intent on killing Deng Qing quickly, he wouldn't even need to use Sky Wings or Flash Spirit.
You should know, when Jing Yan was at the Peak of the Innate Realm, his combat power could surpass most Martial Artists in the Middle Dao Spirit Realm. While in Donglin City, he even fought simultaneously against four Martial Artists at the Early Dao Spirit Realm and killed all four of them. These four were no ordinary Early Dao Spirit Realm Martial Artists; their combat power was exceptionally fierce, especially the Dark Night Assassin and those two elders from the Wen Family. Even a Middle Dao Spirit Realm Martial Artist would find it difficult to kill them.
Now that he had advanced to the Dao Spirit Realm, his true combat power was likely comparable to the Peak of the Dao Spirit Realm. Killing Deng Qing really wasn't very difficult.
