Sam did catch the secondary meaning to what she was saying, and he offered her a small but meaningful smile. Under other circumstances, he would have done something-- kissed her, maybe-- but there was a little too much else to worry about at the moment.
"I'll help you," he said, and then with some amusement, "Cause of death will be Mars and Winchester in the tower, with the crowbar." It was a stupid joke, but the fact that his mood had lightened enough for him to attempt to joke at all was the significant part.
Unable to help himself entirely, he reached over and ran a hand through her hair. Then he made himself go back into full on alert and ready mode, and moved his hand closer to his belt so that he'd be ready to draw his gun if they encountered someone who was armed. Nothing was secure, nowhere felt safe, but he was here to deal with it as best he could.