Castiel flipped over the pages of the book as he searched for something helpful to find out where Sam's capture might be. His eyes skimmed over the words and only bits and pieces of information entered his memory. Apparently the purple eyed people did not eat. They absorbed nourishment from their sun, which was equivalent to Earth's moon, through their irises.
"Any luck?" Dean asked, his eyes baggy from the clear signs of sleepless worry.
"Not yet." Castiel flipped a page.
"Does it say anything about how to kill one?"
"It says here, their almost equivalent to humans. So theory states we can probably shoot it down." Castiel shrugged. He looked at Dean who was dearly concentrating on the road.
"You know we have the notebook, Dean."
"Yah?"
"Well. I just think that maybe we don't need Syth in this mission to find Sam."
A sigh came out of Dean. "Yah. I know. Sam's my main priority."
Castiel nodded agreeably.