Watson couldn't prevent Holmes' tumble over the side of the train. But, he could go down with him.
In a swift movement that he hadn't been capable of since his youth, Watson grabbed hold of Holmes' middle in a rugby tackle even as they both tumbled sideways out of the car. Watson only knew that he had to shield Holmes, protect his delicate skull from further complication. He managed to get under him as they plummeted a few feet to the rocky ground.
The breath was knocked out of Watson by the impact and he gasped painfully for breath, even as Holmes was weighing down his chest. Watson could feel two of his ribs cracked and a massive headache coming on.
Holmes was stunned to silence for an infinite amount of time. He just stared doe-eyed at Watson as they both breathed heavily. Seven minutes later, the train started to slow down, thanks to Mycroft, no doubt.
"Holmes," Watson gasped. He pushed a hand against Holmes' shoulder gently, but firmly. "You have to get off me."
Holmes blinked rapidly and slid off of Watson, still speechless.
Watson sat up, gingerly holding his left side. He grinned at Holmes. "We could have done without that."
Holmes laughed. "No one said you had to join me, old boy."
"Yes, well, I'm just a sentimental fool when it comes to you, Holmes," Watson teased.
Mycroft's voice boomed from a window in the train car that had stopped beside them. "Are you both quite finished with this foolishness or shall I arrange to have the train run over one or both of you?"
Marill: See? Now would an evil person do that? You all judge too quickly. ^^