Now John is just standing there and doing nothing and how is he supposed to know what to do, this is John’s field of experience and he feels like he is about to jump out of his skin and something really needs to happen here.

“John.”
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This is just lovely. I'll take turns with Purrculier1 beating the tar out of anyone who made our lovely Sherlock so nervous and doubting.

The fun part? I've read it about 5 times, and each time his voice sounds a bit different, and so much meaning infuses that single word on every reading.
Insecurity
Wonder
Want
Curiousity
Amazement
Realization
....