Instructions
Attack the monster until it has reached its weakened state. When you are fighting the swamp troll, for instance, damage the troll with basic attacks until it begins to glow.
Press the right trigger button, or the "R2" button for PS3 users, to initiate a grab attack on the weakened enemy. Gabriel will automatically grab the closest glowing enemy near him, causing the mini game to begin.
Press any button when you see the smaller circle expand to match the larger outer circle. The larger circle will remain stationary as the smaller circle begins to fill the space. When the circle flashes, press a button to lock it into place and move on to the next portion of the quick time event.