Puzzle

A puzzle runs in my mind for two months now...a person met within brief moments poses a change...a challenge. He also inspires. Well, the effect is positive for it is strengthening, but somewhat, somehow, a question still runs in my mind. What happened there exactly?(Sigh), how i wish i could read his mind. He gives a feeling of meeting a long lost friend. But I know it is more than that. Who is he really? What is his real capacity and capability? I wish I could find the true answers.