Having never met Dr. Strange and being unaware of exactly what his powers were, Sam startled when the small ring of fire appeared and jumped up from his seat, determined to protect Pepper and her unborn child from whatever the threat was presenting itself.
After a moment, he realized that whatever it was, Pepper wasn't threatened by it or even startled, so it must not be dangerous, so he sat back down and looked at the packet she held out to him. "Uh, thanks," he said. "Are the Avengers needed here?" He wouldn't object to being part of the team again, especially with Steve, Nat, and Wanda around.