Rob Demovsky, ESPN Staff Writer, Aug. 3, 2015 //

GREEN BAY, Wis. — Sam Shields had a pretty good idea what Ty Montgomerycould do after watching him the first three days of training camp. That didn’t help Shields, the veteran Green Bay Packers veteran cornerback, one iota when he came face to face with the rookie receiver midway through Monday’s practice.

The 6-foot, 216-pound Montgomery had just snagged a short pass from Scott Tolzien in the left flat and turned up the field. As Shields lined up for the tackle, Montgomery’s hips shook, freezing the speedy cornerback in his tracks.

A second later, Montgomery crossed the goal line. Untouched.

“When he first got here, you could tell how quick he was,” Shields said. “That move he did, I played the right leverage.”

And then Shields smiled and shook his head, almost as if he were still in disbelief.

“But it was quick,” he said.

So far, the third-round pick has shown off his physical skills — “strong, very powerful, obviously gifted,” Packers coach Mike McCarthy said on Montgomery after the first full-pads practice on Saturday. But what only those behind the scenes at Lambeau Field have seen is how the 22-year-old from Stanford has prepared for moments like Monday.

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