"First time I've ever watched a game from the locker room," Smith said after the game. "... Just one of those things that's unfortunate it happened."
Smith said he "wasn't even aware it was an official at first."
"It was just me and the tight end, and next thing I know (there's) an arm, and (it was) just a reaction," he said. "Rule's a rule. If you touch an official, you're out. ... Aware of it or unaware of who it is, it is what it is, so I could see it from that standpoint."
San Francisco linebacker Travis LaBoy made the tackle on the play, but he also left with a knee injury.
The Associated Press contributed to this report.