Sam either saves his brother, or Dean succumbs to the Mark of Cain.
…there were all the stages of grief, with anger being the most prominent and acceptance not even a close possibility.
The deep breath before the plunge…
“We have to stop,” Cas said abruptly. When Dean glanced over at him he was staring out the window. “In there.” He pointed.
Dean didn’t question him, smoothly pulling the Impala into the sprawling parking lot of the woodland Hills Mall, fearing a lecture coming on about his behavior back the bar they just left. But Cas didn’t say anything, looking intently at the building.