Ronnie Harrison reacted immediately.

When Tennessee's running back and right guard began running toward the flat for the screen pass, so did Harrison.

End result: Harrison, Alabama's sophomore safety, intercepted the pass and ran 58 yards for a touchdown that gave the Tide a 14-0 lead late in the first quarter on Saturday.

It looked like Harrison knew the play the Vols were about to run because of the way he burst forward as soon as he saw the running back and guard begin moving toward the flat. It was a case of film study and preparation paying off.

"I knew it was coming," Harrison said.

Tennessee faced a third-and-7 from Alabama's 37-yard line, a situation Harrison had seen the Volunteers run screens out of in games against Florida and Texas A&M. The Vols ran a screen on a third-and-7 early against Texas A&M.

Harrison was ready when he saw Tennessee lined up in the same formation.

"We knew that when they're aligned like that, we knew what was going to happen," Harrison said, "so we just played it the right way."

Now that's how you jump a screen pass! @AlabamaFTBL's Ronnie Harrison with the easy pick-6. https://t.co/8Ul39jBeD4 — SEConCBS (@SEConCBS) October 15, 2016

Tide defensive coordinator Jeremy Pruitt also deserves credit. Pruitt told the defense to look out for the screen pass prior to the defense taking the field for that possession, according to Harrison.

Then, once Harrison recognized the play and broke forward, it was just a matter of catching the ball, which was thrown directly to him.

"(My eyes) got real big," Harrison said. "I was like, 'I can't drop this. I've got to score.'"