OK, I believe the battle system works like this: you have two bars: HP and ATB. You know what HP and ATB is, but ATB works like this: You see on top of the ATB bar, there is a chain of commands, and on the left-lower corner, there are command lists, well I think you make a list of up to five command, each command takes up ATB, and some attacks take up more ATB then others, so I think you make a chain of attacks that must not exceed the ATB, and you perform that action, example: Attack, Blizzard, Attack, Shoot, Defend, Attack. You use this to make a list to block and make attacks, but you can still move around and interacts with the enviroment much like Kingdom Hearts 2, however, it m ight not be like that, but I just noticed it, if you're still confused, let me know.