Sherlock was deep in thoughts when Greg finished his coffee and got up, grabbing his bag and heading to the bath. He quickly searched for a towl and got into the shower, enjoying the feeling of the hot water realxing his muscles and letting his tension bleed out a little. He sighed, then hurried to finish washing up. He wasn't comfortable with leaving Sherlock alone for so long, even if he did say he was fine and everything. He didn't look it after all, and he was still not back to his usual self. Greg stepped out of the shower and toweled off, pulling a pair of jeans and a dress-shirt, the latter a little crinkled but still better than the worn one, and dressed, buttoning up the shirt as he headed back into the living room, refreshed.
He had been sure he had heard the sound of a violin while he had been in the shower and was expecting Sherlock to sit there with the instrument in hand, doing whatever as he was thinking. But what he found was certainly unexpected. He found him curled up on the couch, a position that had to be hurting with his injuries, and shaking and obviously not noticing or caring that Greg was back. He stared for a full minute, at a loss. 
Finally, he decided to do something. Greg went over to the couch and sat down, gently placing a hand on Sherlocks shoulder. "Sherlock." he said softly, trying not to startle the man too much. "Sherlock, I.." he trailed off, shaking his head to himself. "I'm sorry I didn't come sooner." he whispered, staring at and out the clostest window, before gazing back down at the detective. "If there is anything I can do.... talk, not talk, call John... Let me know, please."