If you are a hero, your share draft will go up quicker than your intimidate. If you are a villain, your intimidate will go up quicker than your share draft. Also when you have a rival, they will slam directly into you, whether you touch them or not. When you start to share draft or intimidate another driver, pause game play. Select "Resume" and the bar will flash for the entire time while it increases. When it stops flashing you will know if they are a full rival or ally.