Honestly I would bet $50 that he didn't think she would fire the third barrel without a hand that beat him and didn't want to have to put in another 20k without knowing where he was at. On the turn he was probably still floating because he's known as such a floater, many people will fire two against him.
And yeah he built himself on cash games, not tournaments... but then again he didn't build his bankroll playing a game where the weakest competition is phil hellmuth
But I do agree Ice, I would not have played the hand that way. I haven't seen much past season 1, could you post some more hands he's involved in?
Also, DN is NOT a lag. He's a situational player. People in that game lag it up so much that being loose passive is probably a winning style.