It could have been anyone who bumped into him, and Dean would have been quick to help. As it was, it was a pretty girl and he dropped his own bag and immediately started helping to catch the papers that were threatening to completely disappear.
"Sorry about that," he said, holding them out to her after he'd picked up what he thought was the last one. As he looked a little more closely, there was... something. He should remember her, right? He knew he'd seen her before.