The figure walked over to him and as they got closer Seb realised that it was, infact, a teacher - which explained why they stood out in his mind. But when this teacher asked if he was Kan he was quite taken aback. He was most certainly not Kan. He'd hung around with Kan once or twice, played Soccer with him a bit. Maybe someone had pointed Kan out and this guy had mistaken Kan for himself. Either way, Seb was confused.
"Uh ...no." he said, simply. It would have been polite to introduce himself at this point, and set right his wrong, but Seb didn't. Not because he is rude, just because his mind doesn't work like that, it didn't occur to him that this teacher might think he was joking and take it the wrong way or something. Seb sat there, looking at this tall, long haired guy for a while. The only distinct thought that passed through his mind was Heh, he looks like he's shorter than me.