His job is to keep an eye on the shortstop and the second baseman. Many youth coaches tell their runners that the coach has the shortstop and the runner has the second baseman. Remember that the number one rule of a base runner is to keep his eye on the ball. If a third base coach can t handle watching both players, then maybe he should be relegated to the dugout. The most obvious tendency of a pitcher with a man on second is the number of looks he makes to second base.
Many pitchers are one lookers and are extremely easy to steal off of.
However, even if a pitcher does A Good job of mixing up his looks he can still be exploited. A good pitcher will vary these looks between zero and at least three. So, assuming his max is three, the base runner should know that once the pitcher hits his max, he will not look again. Here is where technique comes into play. There are a few keys here for execution.