Once you initiate a grapple, you'll be prompted with the same icons, giving you access to varying levels of power moves to pull off. Here's an example: say you're Triple H and you successfully initiated a grapple, tap one of the icons and you'll see a yellow arrow pointing downwards. Slide the stylus down and you'll DDT your opponent's head into the mat. Hit the red icon to rotate another circle successfully and you'll powerbomb his sorry ass. It's difficult to explain, yet handles fluidly once you begin to play.
Each body part can take damage, increasing your likelihood of getting pinned, submitting or falling victim to a finisher. Since there's no stamina gauge to watch, matches are always a back-and-forth affair, so you'll never get too far behind. However, take too much damage and the game will take longer to recognize your screen-scrubbing reversal attempts, so try not to get your ass kicked too hard.
