During the open portion of Wednesday's practice, Polk took a sweep and raced around the left edge of the defense. He put a shake move on fellow rookie (and cornerback) John Reid, and was gone.
Teammates hooted and hollered as Polk blew down the sideline.
"Polk is fast as lightening," fellow receiver DaeSean Hamilton said. "He's a little lightening bug. When he's out there he's making plays. We give him sweeps and stuff like that. He's a (threat) to score every time he touches the ball."
Polk is listed at 5-foot-9, 163 pounds. But he is coming up big so far in camp. And not just running and catching the ball.
"He took my legs out and he was the only guy I had to beat to score the touchdown," Cabinda lamented while recalling the play Wednesday. The 245-pound 'backer has not heard the end of it from coaches and teammates, and understands why.
"He's fast, but he is 5-foot-1, 110," Cabinda joked about Polk.
But he's proving that good — and explosive — things sometimes come in small packages.