She knew him. Knew how he worked. He was trying to fool her. So, she would beat him at his own game. Shadowbird made a concerned face and took a step toward him. "Galaxy. It's okay... I'm here." She reached out her hand for him. Whether or not he chose to take it was beside the point, because she lept up, grabbed one of his raise hands and flipped him onto the ground. 

After this she used her hookshot to get the heck away from him. Swooping down to the ground she rested her gaze upon Envy who was watching with both impatience but also anticipation. "No, get away, you're supposed to die." Envy back up against the building behind her. 

"Um, no. You can't have Galaxy and you can't have him kill me either. He's my partner, I know him all to well. Even in his clouded state." She tackled Envy to the ground and punched her square in the face so that it would knock her out cold. After which she rolled over next to the unconscious body of her enemy. Everything hurt. But at least the civilians were free from Envy's mind-control.