public override void Update(float time)
        {
            Position += Velocity * (float)time;

            if (RotateTowardsDirection)
            {
                Sprite.Rotation = Velocity.Angle();
            }

            base.Update(time);
        }
        public override void Update()
        {
            //Figure the difference between the position of the common zombie and that of the swarmflag
            float xDiff = Position.X - World.Director.SpecialFlag.X;
            float yDiff = Position.Y - World.Director.SpecialFlag.Y;

            //If the unit isn't near the swarmflag
            if (xDiff > 10 || xDiff < -10 || yDiff > 10 || yDiff < -10)
            {
                //Move the zombie to the users flag
                Velocity = ((World.Director.SpecialFlag - Position).ScaleTo(1.0f)) * SpeedMultiplier;
                //set position
                Position += Velocity;
                //Set the special flag
                FacingAngle = Velocity.Angle();
            }
        }