The idea behind the ability is that a party member will come to you as you go to them and then you use cover, IE: 2 party members need to work together a PLD cant go running after someone and expect to use Cover easily. That said, I find the targeting system a bit tricky to really use this ability effectively. I'd prefer that they just made the range longer OR made it so that when you use Cover, it automatically covered the person with hate (of the mob you are targeting).