Dean and his team were having lunch together when they'd been called, someone was in a car crash and there were some survivors. They rushed together and got in their firetruck, they drove their with their siren on. Once there they stopped and quickly went to see the situation, Dean was the first to find you.

He looked over at the cars and saw you. "Hey, I'm right here. I'm here to help." Dean was too far from you for you to hear it, he was partly saying it to himself as he ran to you.