Sherman had the day off from playing, as did free safety Earl Thomas, who also was acting as a coach for the secondary.
Sherman was offering instructions to Simon on every play. It must have helped because Simon has waited a long time for a day like this one.
The second-year cornerback from LSU missed his entire rookie season with injuries to both feet, but he's finally healthy and showed everyone what he can do on the final day of organized team activities.
Simon had two interceptions in the practice session, one off starting quarterback Russell Wilson and one off backup Tarvaris Jackson. Simon also had a big stop near the goal-line on a pass to fullback Derrick Coleman.
Simon chuckled when asked if he thought Sherman probably would take credit for his performance.
"I think so," Simon said. "He was out there coaching me along the whole way, giving me advice. If I messed up on something, he came up right after the play and told me what I did. He's helping us get better."
Simon (6-foot-3, 200 pounds) couldn't have been much better Thursday. The 2013 fifth-round draft choice is like a rookie all over again after having surgery for fractures in his foot that kept him off the field last season.
But he played like a proven veteran, starting with a leaping interception on a deep throw from Wilson intended for receiver Taylor Price. Simon's second pick came on a fade in the end zone from Jackson intended for Jermaine Kearse.
Sherman was so excited about it he ran on the field jumping up and down like a proud parent. Simon is just happy to finally get on the field.
"I've been hungry and it was really difficult [sitting out]," he said. "You want to be out there and compete, but I came in not healthy and that set me back. I had a stress fracture in one foot and a broken bone in the other."
The stress fracture happened on the field and the other fracture was a fluke accident from running on stairs. Now Simon is trying to make up for lost time.
"I still learned a lot [last year] and soaked it all in," he said. "I learned the game is much faster at this level and quarterbacks are way better than college. Everything is on the money here. You don't go out there and take a play off because everybody is good."