Here are news and notes from USC's Saturday practices that won't make it into our other coverage of the day.
During the latter half of the Trojans' first two-a-day of the 2012 season, Aundrey Walker continued to sit out with an arm issue of some sort and Lamar Dawson did not attend practice with an unspecified injury.
Torin Harris did not practice after injuring his hamstring on Friday.
Woods, Agholor and Farmer also sit out
Receiver Robert Woods got the afternoon off for the Trojans after practicing in the morning. It sounds as if it'll be standard practice for the rest of USC's two-a-days this camp.
Freshman Nelson Agholor exited the afternoon practice early because of an unknown ailment and stayed on the sideline getting treatment throughout the session.
Sophomore George Farmer, still nursing his injured hamstring, sat out of team drills after participating in individual drills. He has yet to participate in team drills this fall.
Tuerk might be next in line to start
Since Walker, USC's projected left tackle, went down earlier this week, the Trojans have used walk-on Nathan Guertler as the first-team left-tackle in drills.
That changed Saturday, when freshman Max Tuerk shifted over to the left side for a considerable portion of the afternoon practice. He had previously been working on the right side, where he was impressing coach Lane Kiffin and the coaching staff. Fellow freshman Zach Banner was moved from left to right tackle in a corresponding move.
Kiffin said Tuerk was "naturally" going to struggle but expressed hope that he'd get the hang of the position sooner rather than later.
If Walker's not healthy in two or three weeks, it seems as if Tuerk is the next candidate to assume a starting role -- whether that'll be on the left side, as a direct replacement, or on the right side, with Kevin Graf sliding over to the left.
Kiffin said he doesn't have a specific date in mind when Walker has to be back to start on Sept. 1 against Hawaii.
"I don't think there's ever a certain date for things," Kiffin said. "You just have to know what the issue is. I think he'll -- I think we'll -- be fine."
Pullard works at middle linebacker
As Kiffin said would happen earlier this week, redshirt sophomore linebacker Hayes Pullard worked some at middle linebacker.
He earned positive reviews. If Dawson continues to be out for any sort of extended period, USC's backup option would be to start Anthony Sarao on the weak side and move Pullard over to the middle.
That might actually be the plan to give Dawson a break sometimes, too, because the only other option is true freshman Scott Starr.
Final notes: USC's morning and afternoon practices both checked in at less than two hours each. ... Junior defensive end Morgan Breslin capped off the day with a leaping interception of Max Wittek in the final play of the afternoon practice. ... The Trojans have three more two-a-days scheduled this month.