Wu Dao had severely injured the Great Mighty Celestial Dragon, and now, he displayed the Divine Sky Taoist Magic again, summoning the Nine Heavens Divine Thunder, specifically the Purple Dawn Divine Thunder this time.
Among the Nine Heavens Divine Thunder, the Purple Dawn Divine Thunder is considered less powerful, with several others surpassing it in strength. However, with his current power, controlling it was still beyond his reach; he feared it might backfire, harming himself instead of his intended target.
Playing with fire leads to burning oneself, and the same goes for playing with thunder.