It's not the end of the world if he misses.
A play on the term "not the end of the world". People will sometimes say that, if an event went wrong, it isn't the "end of the world" i.e., it's not that big of a deal. But here, it literally might be the end of the world if the angel hit the earth pinata --- i.e., if this supernatural being hit the earth with a baseball bat, it would probably cause billions of deaths and the end of the world. But if he misses, it is literally not the end of the world.