Back in the Subway!
Billy wasn't sure what was happening up top, and so he trekked back through the tunnel to pull the injured out. It would be easier for whoever came to help them if they were out in the open. He'd gone back and forth, laying them out safely on the platform.
He wasn't sure what to do with the last of them. She didn't look good, and he'd spent ages trying to reassure her, to get him get her out of the subway.