Holmes just nods. He'll put it aside for now, as he always does, but this will haunt him until the end of his life, whenever that might be.
"Everyone has their own idea of ordinary," Holmes counters. "That's what makes it extraordinary. Your use of magic, for instance. While quite ordinary to you, to me it is one of the most remarkable things I have ever encountered."
Holmes watches the exchange silently, rubbing his chin. He's quite bowled over by the whole experience. "Good afternoon Winky." To stoop and offer his hand seems wrong to him, he looms over the poor, er, girl, so he squats on his haunches and extends a hand. "I am very pleased to make your acquaintance." No falsehood that! "Sherlock Holmes, at your service."