[It's strange, the way the pleasant and helpful demeanor - not exactly something he associates with Horikawa's owner - doesn't as much fade but shift into something more familiar. Watchful, steady, but with a hint of an edge to the calm.

(And the gesture too, the instinctive hand reaching out to support him-)

He's torn between laughter, because it's so unexpected, and something that tugs at his heart and tempers his smile a bit with solemnity. After a moment of searching carefully for words, he folds his hands neatly and sinks into an elegant bow, while still maintaining eye contact, still smiling.]

I'm sorry, I'm afraid I've startled you. [And honestly, in a way he's been there himself. People with names the right names but the wrong faces, the pangs of recognition counteracted by the differences... He's not exactly about to make matters less confused, but at the very least they should be less alarming.] I'm not from the same world as you, so you wouldn't recognize me, but- My name is Okita Souji, and I certainly recognize you... in a manner of speaking.