The Doctor wished that he could say that Shannon had calmed and that's why her breathing had leveled and her speech returned. His mind knew it was the inhaler and not the loss of panic.
"Oh, no, she's gone." Really, what he ought to have explained was that she was stuck on a parallel world out of his grasp for the rest of eternity unless he wanted to risk ripping a hole the size of Belgium into the fabric of space and time. He could, if he wanted, rip a hole. Then again, it probably wasn't a matter of want - it was a matter of restraint and responsibility and sensibility. It just wouldn't do saving the world just go and ruin the universe for her. It ripped him in half, honestly. Even though the years went by the ripping never truly seemed to stop - just slow down a bit.
He watched as she looked to the door and tried to think of something else to chat about - to keep her calm as the noise began to sound distant outside the barricaded door. "Did you see the stew they had in the convenience store?" He asked off handedly, pulling up a spot on a bench probably once intended for looking at the fake-Van Gogh.
"I'm not usually too partial to stew; though, I thought perhaps the rest of you might like it," he motioned to the forgotten basket and it's few canned goods.