With live pitch, I tried to keep one eye on the batter and one eye on the pitcher, to gauge the batter's swing. However, with live pitch, the batters aren't so swing-happy, and they watch the pitches a lot closer. Every pitch doesn't result in a swing. So, you learn to watch the habits of the players. Some pull back ever so slightly with the bat before they swing; others' eyes get wider, some stick their tongues out, and others yell.