She was joking. This was good. Whatever panic attack she might be having wasn't so bad that she wouldn't be able to get out. He followed the sound of her voice and frowned. There was debris settled on her. He didn't know if he could go back and ask Buffy for help, but he needed to get her out and do it quickly. He would just have to do it with one arm.
"I'm going to get you out, but I have a broken arm so it might take some time," he said, going close to her. He started moving the debris as best he could. "I don't know you very well, do I?" he asked gently. "Why don't you tell me about yourself." Because really, anything to get her mind of the panic and focused on other things would help. This was going to take a bit of time, but if she was alert and not in a full blown panic it would make things go much more smoothly.