Although there's a growing chorus of complaints about the replacement officials the NFL is using due to a labor dispute with the regular officials, Harbaugh said he's not concerned. "We don't even think about that," Harbaugh said. "The refs will be fine. They will be what they are. Everybody is going to try to do their best. Our guys have plenty of things to worry about besides the officiating." ... Reserve inside linebacker Josh Bynes has been dealing with a serious injury, cracked vertebrae in his spine sustained during a goal-line scrimmage at the start of camp. "Josh had a back injury that probably sounds worse than it is," Harbaugh said. "On the end of your vertebrae, he basically chipped a couple of pieces off of the boney protrusions on the spine. It happens sometimes in car accidents. It was really unusual for a football injury. It's about a four-week injury, maybe a five-injury. He's coming along really well." ... Flacco had a bit of fun, firing a spiral off the wall directly above reporters' heads. "I just wanted to see if I could scare you guys at all," Flacco said with a laugh. "I was a little bit scared about where the ricochet might come off and hit somebody, but I just wanted to send a little scare. I said, 'Hey, you think it'd be funny if I did it?' And everybody was like, 'Yeah, do it. do it. do it.' Yeah, it was unanimous."