Greg didn't believe him when he said he was fine. He had noticed that Sherockw as still shivering and when he had looked up there had been something in his eyes, Greg had not seen there before. It had him wondering for the first time, just what Moriarty had done while he had scrambled to find them. His conscience weight heavily on him for not having been faster, not having come and safe him sooner. 
He nodded at Sherlock and helped him up, together they slowly made their to to the bathroom, where he sat him down on the edge of the tub. "Take your time. And be careful with your arm, alright?" he said, hesitating, but then heading out. He had thought of helping him undress and getting in, but then again, it felt like that would be awkward for the both of them. "Call for me, if you need some help. Or you're done." he added, then went outside, sitting on the couch and waiting for him to call for him. His eyes fell on the case files, but after having sat on them all night long, he couldn't bring himself to go on at the moment. He really needed Sherlocks input on that. He was just unsure whether the detective was actually up for it.
He heard Sherlock whisper his name. He would've missed it had he done anything else, but he had been listening to catch every possible hin that his help might be needed. He got up, worried at the way Sherlock had called for him. He knocked on the bathroom door before opening it. "I'm coming in." he declared quietly, then stepped inside. He was a little surprised, shocked even, to see what state Sherlock was in. He wasn't as pale as he had been yesterday, but his eyes were definetly red, which they hadn't been before. Greg tried not to visibly react to it, instead he stepped closer to help the other man out.