Do you think what we are seeing now is happening at that very instance of time, well, I am afraid it isn’t. What we see has already become a past instance.
This is because our brain takes some amount of time to process vision. We know the light is faster than sound, but the interesting aspect here is that our brain takes more time to process vision when compared to sound. This is the reason why in a running race we use firing sound from a gun instead of a light flash, so athletes can start the race quickly, again because sound gets processed faster when compared to light. Our brain is crazy I say :)