Most of the time Sherlock moved with a predatory grace that was, frankly, intimidating. John had seen it the first time they'd met, the fluidity in his movements and the smoothness of his stride, betraying a confidence not often seen. Sherlock was extremely confident in himself and his deductions and showed it. Most of the time it led to people wanting to punch him - even John on occasion.
Unlike now. This Irene Adler knocked Sherlock off balance. He was unsteady on his feet, like a newborn lamb learning to walk.
It was something that almost disturbed John, to see Sherlock's faith in his own deductions shaken by this voracious woman who was so used to being at the top of the food chain. John didn't like it, not at all.
In some ways Sherlock was still like a child, including in fields of human interactions. He didn't need to be belittled, of sorts, by this woman just because, although their intellects seemed to follow similar paths, she found herself knowing what people liked. Sherlock was no worse off for not knowing this.
John didn't know why he disliked Miss Adler so much - he wasn't jealous, no matter what she or anyone else might say. He supposed it was because it unnerved him so much to see Sherlock off balance.
