[Sherlock's not quite sure what to expect. His imagination leaps wildly to perhaps some fire-based power or something to do with metal. Before he could do much else his eyes widened as John lifts his palm over the lighter and just--burns himself!?]

John--what--NO--

[His protests were pointless after his heart had stopped for entirely too long in the fear that his friend had hurt himself, as he realized a little too slowly that he was in fact, not harmed.

He blinks for a good twenty seconds, his voice disappearing a moment as he tried to clear it with a cough.]

You...that...didn't that hurt?!