Very interesting. I love the way you have formulated your theory. :)
What you say makes perfect sense, although I never experience that severe symptoms after particularly intensive or prolonged exposure to the company of others myself as I am more of an extrovert than an introvert. What I did experience starting from the time we were having coffee at Finlayson's was tiredness to some degree. My thoughts started wandering and I experienced some difficulty gathering them. I don't know if anyone noticed that but that's how I felt. I was on the verge of choosing to go home right after the coffee.
Despite being more extroverted than introverted, I have pretty good tolerance for spending time alone. Photography is a good hobby in the sense that it is best engaged in alone so as to minimize all distractions. An evening in good company does not wear me out. I usually feel completely normal the following day.
I noticed but it was already pretty late then so it's to be expected, normal people feel tired in the evening. What I find is that once I'm out of the house socialising and in good company, I don't want the evening to stop, I have all the energy in the world and I guess I don't know how to give up and go home. It happens to me often when I'm out at a bar, I am ready to be out there until the wee hours of the morning, even though it would probably be a lot more reasonable to go home earlier in order not to burn myself out.
I think it's a valuable skill to be able to spend time alone, and vice versa, to be able to tolerate people :D
I noticed you participated very actively in the conversations, which makes sense in light of your description of yourself as a part-time extrovert. Taraz on the other hand socialized and generated ideas like a machine (heh) without demonstrating any degree of fatigue. He did have one advantage over the rest of use, which was the fact that he was able to use his native tongue the whole time, though.
I very much like to talk when I'm in a small group of people whose company I
enjoy. It's easy to see that Taraz is used to talking a lot to all kinds of different people, and he knows a lot of what he talks about, it's not just some fluff like some people who like to hear their own voice all the time. It was good that we had to talk English, not a lot of chances to practise that on the daily basis, but it certainly takes a little more out of you when it doesn't come so naturally.