Jack was more than a little pleased that his manic driving paid off. He was seriously thinking that maybe he should quit his day job and start racing for a living; it wasn't like he could die. And the payoff was something he could live with. Not that he lived for money, but with a baby coming, they could use every dime they could get. He knew how expensive babies were, even in this day and age, and he was looking forward to quitting his job anyway.
He was amused that he -- of all people -- had ended the race on his roof. The car was great, ran good and wouldn't take much to fix, he was sure. Cars were easy to be replaced. He was just happy that he had come out in (mostly) one piece, although his arm was smarting; he may have sprained something. He was wondering through the crowd to find Gwen or Ianto, really just wanting to grab his winnings, get his pictures and go home.
While it was all a good cause, he was exhausted and hungry. Mostly the latter two.