Brilliant! Coriander attempted to test her, but she turned it around and put him to test instead. He would comply, there was little time to attempt a turnabout on his own - and, proud as he was of what little skill he had, he would not turn down the chance to show off. That was one weakness he enjoyed having having taken advantage of.
He quickly cast his gaze around, searching for a possible solution. There! While he lacked the arcane sight to identify enchantments and glamours with, he's learned to recognize the telltale sheen the Garden's staff used to mask the entrances for their use only. The biggest hurdle to overcome was the perception redirecting hex that would make his gaze miss the charmed spot. Quite the clever idea, but one that he could easily get around now that was aware of it; all he had to do was to search the surroundings and map the blank spot in his vision. "This way."
Of course, he had no way of opening the door. This particular ensemble of his lacked anything that could have been used as a lockpick - an oversight he would later see to correcting, it wouldn't do to be caught without tools he put too much effort into learning to use. Whereas he and Kana have already infringed slightly upon etiquette, asking for a hairpin would not be an acceptable move at this stage of the dance. Moreover, while he knew of the door's existence and its secret, that gave him no insight in the mechanics of opening it. No, all he could accomplish by involving her would be making a fool of himself.
The footsteps were now close enough to be heard clearly and discerned as two separate sets, accompanied by a cacophony of chatter and laughter. Excellent, a pair would be less inclined to break from the pleasure of each other's company and go bother someone else. He indicated the direction he needed them to go, hoping that the peculiar enchantment wouldn't confuse them into losing their way - or even worse, make them turn around and face the other guests! The horror!