Dean had jerked his head around when he heard the bridge moving. He then jumped as she did when he heard the gun shot and saw something fall in the woods. Damnit. He ran around, "Get in the car, we're going into the castle. We'll get you to safety." Then he could plan what to do next. Like find his brother.
With doors closed, Dean started his car and headed for the bridge, flooring her gas peddle and pointing her to go over the bridge. Upon entering he slammed on the breaks, sliding the car around to it was pointing back toward the bridge. He jumped out after shutting his baby off and moved around to get her out.
He looked around to see who had helped them, "We're safe for now, sweetheart," he spoke to her. His hold on her protective now cause he wasn't sure what to expect.