If he had known she had been smirking there was a good chance he would have hauled off and hit her in a very Dean-like move, so it was a good thing he hadn't or they would've had a lot of attention that was unwanted on Sam's part.
"We know it's an Acheri demon, and I think it's connected to a man named Bob Horton." He told her distractedly, as his phone was out and he was hitting speed dial one--his brother.
The phone rang and rang before going to voicemail, which made Sam a whole shit-load of nervous. Usually if Dean couldn't talk on the phone because he was in the middle of an investigation he turned it off so that it went straight to voicemail. Him not answering after that many rings was a warning sign. "Dean, it's Sam. I found some leads on who might be" Here he paused. If Dean had been taken by the feds, that wouldn't be good. "doing the job. Call me back."
Yeah. He sounded worried. But it was his brother so if Ruby made some kind've snide comment he was going back to the Impala and shooting her on the spot.