Standing your ground just means you don't have to run away. Whenever your assailant backs off, you have won, or at least aren't under attack atm, so you can afford to wait for them to go away.

If they don't go away, but try again, or another tactic, you had better have remained prepared.

However, it isn't standing your ground if your attacker is retreating. Stand your ground is only a defense, not a reason to take revenge on someone fleeing.