I did watch the game and it seemed to me that three things played into UTK's success on defense for most of the second half.
1. Earl Bennett's injury was for real. He hardly played at all in the second half and without him on the field the Vols were able to play more man coverage and get an extra man in the box to stuff the run.
2. Vandy went conservative too early trying to sit on a 15 point lead with 24 minutes of football left to play.
3. UTK picked up the tempo in the 4th quarter. Part of this I attribute to the inevitable slip in the quality of 4th quarter play that you see from teams with a lack of depth, such as Vandy. I also give the Vols credt for making some plays.
I am sure that on the Monday talk shows in Nashville there is going to be a lot of debate about the roughing the kicker penalty. It was hard to tell whether the contact rose to the level that a flag should've been thrown. If not, Colquitt did his job and sold it to the refs.