For what it was worth, Oni gave Nayru a good trashing, and even managed to throw her out of the Spirit Temple.
The bad news was that the temple was collapsing in itself, and the entrance had been blocked by huge chunks of the ceiling that had fallen on it.
And Link and Sheik were still inside the Temple somewhere. But hopefully Sheik had finally come to his senses and taken Link out of there. Dark closed his eyes, but the mind bond with Link was still sealed off. He sensed the magic emanating from the block between them, and knew right away it was Oni's doing.
Zelda stirred in Dark's arms, and Dark had to pull himself out of their mind space. He could drag Zelda out of the Temple by taking her through the shadow world like he had done with Link, but she was weak and despite her lack of injuries, he was sure she had gotten a few invisible injuries after being possessed by Nayru, just like Link was completely out of it from being possessed by Farore. Even Link, fully rested and healthy, had barely made it through the shadow realm for a few moments. He wasn't ready to take that risk with Zelda.
"Hey, can you stand up?" asked Dark, looking at the boulders blocking the exit. If he tried really hard, and called the shadows with the power that Impa had given him, he might have a chance of making a small exit that they could use to squeeze through. Although by the sounds of the fighting outside, and the near constant earthquakes, that wasn't the best of ideas. Still, he didn't want to ask Zelda to perform any kind of magic right now.
Zelda slapped him across the face. "Don't touch me!" she yelled.
The strength of the blow made Dark fall down on his ass and let go of her. Zelda scrambled away from him, but didn't have the strength to get up, so she crouched on the floor, ready to strike.
"Hey, calm down!" said Dark. "Look, I'm on your side. We have to get out of here."
Zelda looked around her. "The Spirit Temple? Why did you bring me here?" she asked.
"I didn't bring you here! You came here on your own. Or, uhmm, well Nayru was in control of the body at the time, so I guess Nayru brought you here."
Zelda held her head. "N-Nayru…I remember. We fought, and then we… I…," she said.
Dark went up to her and tried to help her get up. She was strangely cold for a mortal. "Come on. We have to get you out of here. The temple is about to fall down on us," he said.
"You're Link's shadow. What happened to Ganondorf?" asked Zelda, leaning on Dark's shoulder.
"Hell if I know. Din took him away, but I think Oni fought her off. I dunno. Come, stay here while I try to open a spot through the entrance," said Dark, letting her lean against a crumbled piece of the stairs at the entrance. He didn't want to let her sit down while pieces of the ceiling were still falling all around them. She was quick enough on her feet to avoid the debris, even as exhausted as she was.
But the Spirit Temple fell fast, and every shock from the battle outside shook the foundations even more.
Dark called forth as many shadows as he could, but he felt that the power Impa had given him was fading. His hold on the shadows slipped, and he could feel them rebelling, lashing at him.
"Ugh, Impa's power is dimming. She must be using it all on keeping the barrier up," said Dark. Still, a few shadows obeyed him, and they slowly wedged in between the rocks blocking the entrance. He stopped trying to call any stronger shadows, and instead went on to try to pull out the rocks himself.
"You're not with Ganondorf," said Zelda, in a low voice barely audible over the falling debris.
"Told you I was not. But whatever. Blame the shadow for everything," muttered Dark. He kept pulling out rocks, but he wasn't making much way.
Zelda pushed herself away from the stairs and went on to help Dark. "But why? Why are you trying to help me? I know you can get out on your own," she asked, helping Dark push a boulder away from the entrance. It wouldn't budge.
"Hey, you said it yourself," said Dark. A part of the ceiling collapsed on the last couple remaining torches, and an absolute darkness fell over them. "I'm his shadow. I want to save people too."
The Spirit temple shook. The pillars crumbled, and the entire structure fell.