Helen meets Nikola's smirk with a very pointed expression of her own, her lips pursed into a rather tight line. Really, Nikola? Not that she expected anything else than what she gets, but it's the principle of the matter. Giving him some variation of that expression is as expected as him showing off to earn that expression.

She decides not to grace him with a response until he's provided her with the change. Only then does she glance downward, still slightly disapproving. The only good thing is that he had the presence of mind not to panic the other characters. They could have dealt fine with a panic in the holodeck, but it's really better that they didn't have to worry with it.

"That should do," she agrees. Not-so-gently guiding Nikola towards a newspaper stand, she dips slightly before nodding at the papers the man is carrying. "I'll take one, if you please."

"Of course, Doctor Watson," the man answers quickly, scrambling to fulfill her wish. She nods to Nikola to pay the man -- just because she can at this point, not because it would be expected of the time period -- and he tips his head to them both. "Good to see you, Doctor Watson."

Helen makes sure they have several paces between them and the helpful man before she glances at Nikola, eyebrows raised. "Not the turn I would have expected."

Because if she is Doctor Watson, that means he is Sherlock Holmes. Interesting.