Other nuggets from Riley:
* Mick Stoltenberg, the projected starter at nose tackle, sat out again as he goes through concussion protocol. The junior from Gretna, who also missed Thursday's practice, likely will return to drills Monday, Riley said.
In Stoltenberg's absence, true freshman Deontre Thomas (6-foot-3, 280 pounds) has gotten plenty of work at nose tackle with the top unit. Riley said Thomas is "cat quick" and offers "a good change of pace" compared to the mammoth Stoltenberg (6-5, 315).
* Tre Bryant, a sophomore running back, returned to action, although he did not participate in scrimmage work. Riley has said Bryant has been slowed by nagging knee soreness. "We've been careful with him as we've gone," the coach said. "He took a couple days off." In addition, junior receiver Bryan Reimers, who has stitches in his head, did some individual drills without wearing a helmet.
* Nebraska pushed through "a lot of situational" scrimmaging -- red-zone drives, drives out of the end zone, plus-40 drives and special-teams work.
Riley is often hesitant to single out too many individual standouts, but he did mention junior receiver Stanley Morgan as someone who performed well.
"Everything we think about Stanley looked like that today," the coach said.
He also said slot receiver JD Spielman made a couple route-running errors, but added, "His play-making ability was out there front and center again today."
* Riley said he's been excited about the growth of redshirt freshman cornerback Tony Butler, who adds needed depth at the position after moving from safety.
"What I'm saying is that looks like a positive move," Riley said.
Avery Anderson, a sophomore, also drew praise for his work at corner.