By and large, Tyson is more confident 1-on-1 compared to in groups. However, once the crowd becomes large enough Tyson is even more confident.
Though Tyson may still stutter in a one-on-one conversation until he’s comfortable enough with that person to avoid stuttering, he is still more confident dealing with one person than a (small) group that he doesn’t know.
Tyson needs to know that he can escape any given situation to feel safe, knowing his odds to outrun or beat the other person in a fight goes a long way to soothing Tyson’s anxiety. Even if he knows with certainty that he can outfight each person individually, multiple opponents shifts the odds against him.
However, Tyson spent his entire childhood being groomed to teach large groups of people. The crowds on London’s streets put him on edge, because he’s dealing with many small groups of people all at once. It’s not a continuous surrounding that he can familiarise himself with.
When he has the (near) complete attention of one large group, Tyson is honestly in his element. He can take the stage to guest lecture at any university without stuttering even once, without needing to know anyone in the crowd. Naturally, he is most comfortable when talking about mathematics somewhere familiar, such as Cambridge, but his ability to speak and command attention remains the same.
Largely Tyson’s work with the web is done on his own or with one other person, someone he trusts or one employee of the Moriarty Mirrors.
It’s rare for Tyson to be required to lead a group, but in those cases, Tyson does better than most would expect of the second-hand pet. It’s similar to stepping back into his life in the army. He may not be comfortable, but that doesn’t matter. He has a task and people who are depending on him.
It doesn’t matter if Tyson can’t do something.
He will.