According to Vols redshirt senior wide receiver Bru McCoy, it's because Tennessee wasn't confident that they could replicate the success of the first drive of the game.
"I can't really pinpoint it exactly," said McCoy when asked about the struggles after the first drive. "We came out fast, started fast and then sort of lost the momentum a little bit. Me personally, I think we started thinking back that we couldn't do it again and we just had. It's a mindset thing. It's a confidence thing. It's trusting one another in what we are capable of doing. It's really just that."
Here's the full quote.
When there's ambiguity, we tend to interpret through our own preconceptions. Those who are sour on Milton interpret to mean lack of confidence in Milton. Those who question playcalling and OC have that interpretation. Those who think UF is in our player's heads take it that way.
Reality is none of those things are hinted or even implied.