How very ironic that the Doctor - this one - was thinking the exact same thing. If it was possible to run into your own clone, then his previous regenerations weren't out of the picture, right? But, that would get confusing fast if you needed one of them and they all responded to "Doctor." Still, it was something he could deal with when he's more acclimated.

What does snap him out of his thoughts was the man approaching him. He wonders about the bowtie, and if he was aware that this was the future him, well - he would have asked about his choice to wear a bowtie of all things. Then again, all of the Doctors had their own fashion choices. (Some weirder than the others, at that.)

"Hello there!" he says, shaking his hand. He notices the little invisible spark between them, idly placing that in the back of his mind. "Why thank you - you are, too. Might I ask for your name?"

He has a feeling that he was about to get even more confused about his current situation. Just a bit.