[It's certainly a stab to the heart. John knows well enough that Sherlock isn't the sort of man to offer much in the way of reassurances, but nothing at all? His mind goes to the darkest possible reasons. But he will acquiesce. What else can he do?

John takes a moment to pull himself together, wipe his eyes, and just generally get his expression under control. It's longer to try to prop up the tablet across from his with non-functional hands. Several minutes pass with nothing, then the video starts up. Sherlock will see John doing his very best to remain steady and even. Even with his efforts and the dimness, it's likely clear that he's been crying. He's sat cross-legged on the floor of what appears to be a bathroom is the empty towel rack above his head and part of a visible tub are any indication.]

If you... if you want to see my hands or the wounds that've healed up, I can show you as best I can. Might need to wait 'til we're together for a proper examination.