During combat attack phases, the player must perform any of the following counter attacks three times:

When an enemy ducks an attack, counter with a left or right kick.
When an enemy evades an attack, counter with a kick in the direction your enemy is dodging. For instance, if the enemy dodges to the right, you can counter with a right-legged kick.
When an enemy blocks an attack, counter with either a double punch (both fists at the same time) or a double kick (jump).

Once this has been done three times, the game will prompt the player to call either Tigress, Mantis, Crane, Monkey, or Viper. This can be done by saying "Tigress, attack!" or "Mantis, attack!" and so on.