"Sherlock!" he responded, sighing with relief. He was okay. He was clinging to him, he was nuzzling into him- that alone was enough to tell him that this was still his Sherlock. Oh, thank God! It didn't really help to explain how Sherlock had apparently been involved in a plane crash- had John been in the plane, too? Had the train turned into a plane? It seemed to be able to travel underwater like a submarine, but surely this was ridiculous even by their standards.
"I don't know- I don't know-" he responded, trying his best not to sound panicked about it. "Come on, love- we need to move. This thing could blow at any second," he told him firmly, trying to drag him to his feet, wrapping an arm around his waist. "Are you okay- are you hurt?" he asked softly.