See, that makes perfect sense to me, and I don't even watch sports (though if I do watch a sport, it's NFL football).The quarterback lines up at shotgun on third and long, reads the D and senses a blitz, and calls an audible, then takes the snap, and throws the quick screen to the fullback who gains enough ground to move the markers.
Now, that is easy.
Having married into a family headed by an ex-pro athlete, it was fascinating to watch virtually any sport with my FIL. He could explain things that the average, and even the above average viewer, would miss. The funniest thing, though, had to be when we visited them one year in Florida, and my wife and I'd gone out to run some errands, and when we came back to the house, Bob Feller (legendary baseball pitcher) was sitting at the table having coffee with my in-laws. He'd just stopped by for a cuppa!