Only four chefs remain in this first half of a two-parter season finale in Napa. For the Quickfire challenge, things get a little wobbly when they have to prepare deliciousness on a moving train. Will somebody lose a thumb? Will they be too distracted by the idyllic vineyards they're zipping by? And as Eater reminds us, Padma is still preggers, which adds to the fun of it all. Who are you rooting for?