Jan can see that Walter is hesitant to speak of his own experience with respect to the vision. Much as Jan wants to know, he isn't going to insist, as that would be rude. No sense in sacrificing the friendliness of this conversation for the sake of curiosity.

Likewise with Walter's work.

But what an interesting reply, as regards the agility! "I guess that makes sense. If time slows down for you, then you can fit more actions into the same time."