Feril Salder was a security officer on the USS Majestic. He helped Chief Engineer Helfner Berinski get to the spy on the ship along with Yukoy Debber.
He attacked the spy after the spy fired at Berinski, but was knocked unconscious a few seconds later after the spy hit a console. A few minutes later, he regained consciousness, and restored power to the bridge of the Majestic, along with Yukoy. (Star Trek: Mirror Wars)