Sam just wanted Cas to figure out something that could help him. Something that would be able to make him stronger and healthier and hoping that Dean wouldn't worry anymore. Though he really didn't want Castiel to wear himself out by helping him. He wasn't sure what would happen to his friend if he took on to much.
Feeling what Cas did he shuddered for the moment and then closed his eyes he knew what Cas was doing and that was trying to help him. "Okay.. did you see anything?" he asked he just wanted to know if it was good or bad or maybe something else entirely.