You have the momentum going into the 2nd half. To start the half the Pats get the ball at the 45 and can do nothing. You put together a nice drive and have it forth and a half yard inside the fifty. What do you do? I have to figure your 5 or 6 to one to make it. Show some confidence in your offense and defense and go for it. Indy probably would have lost anyway but everything changed when they punted.
