I used to do a bit of clay shooting ad remember watching an old guy hitting everything that flew, but it took me a while to figure out what he did.
He would shout pull, the clay would fly...BANG...clay sho down. For those that don't know as you hit the clay the next clay comes from the other direction. Then I realised what he was doing. For the first shot the shogun was fired from the right shoulder, then he would swap shoulders to take the second shot. He did it so quickly that it took some time to spot what he did.