Hello James,

On your battle board, you have two sections: Opponents and Revenge List.
Under your Opponents section, you will find targets that you can attack right away (they are not in the hospital).
Under your Revenge list section, you will find players that have attacked you in the past 7 days and that you can attack. However, if they are in the hospital, you will not be able to attack them right away and will have to try again later or to wait until they appear under your Opponents section. Please note that the limit under one is considered to be in the hospital is 20% out of their maximum health (it's not a constant and will increase as one increases their maximum health). Also, please note that this number is not public and you cannot tell what health percentage your opponent has.

As for the non-player characters, you have a selected number of targets that you can hit a couple of times, until their health is below 20%, when they move into the hospital, just like a regular player. After a while, when their health regenerates, they will re-appear on your battle board.

Please let us know if you have any further questions or if you have any other issues with the game.