TFboys really fired, and the flame jumped to shoulder height, but it looked like P?

Problems of post-production technology of producers. But this is a real flame. But who knows that the last film said it was made, this real flame. After all, this style is when shooting. You can take multiple photos. The audience should not know which lens is used in the final product. So the final product looks like P, or it may be P, but no matter which lens is used as the finished product, it should be understood that safety should be the first.