Is it because Bruce Lee can't see clearly, so he should slow down the film when making it?

There is a saying that when filming enter the dragon, Bruce Lee and Ogada were competing in the ring, and Bruce Lee had a fly kick. At first, the camera was shooting at normal speed, but the effect was blurred. Bruce Lee and the people on the set know that this is the real speed, and there are no special effects. But if it is played in front of the audience, everyone will definitely think that it is speeding up the filming and deliberately deceiving the audience. So from this perspective, they have to slow down in order to be "real".