Why did the Saints go for 2 points with :41 left?

I didn't see this posted anywhere.

Why did the Saints go for 2 points at the end of the game?

The sucessful attempt put them down 13 points which still requires at least two scores. No way you can kick 2 FG's and score a TD in 41 seconds.

The TV announcers said it was to practice the two point conversion. That seems wrong to me becuase 1) this is a game not practice 2) why show your future opponents one of your 2 point plays.

Could it be that Payton is thinking a long way away to the points differenental tie breaker?