Cass leans heavily against the door frame, trying to speak while he’s still upright.
“I need…your help-…” it’s almost a whisper.
“Of course– of course, Cass-” Balthazar reaches out, pleading. There’s nothing he can do until Castiel releases him from the circle, and Cass is rapidly dying. Balthazar can see the welts all across his body, burning him like a fever.
Castiel lurches forward, sinking to the floor without support. As Balthazar kneels, pressing as close as the barrier will allow, Cass reaches out, dragging two bloodstained fingers through the line of sigils.
The cell is opened.
“…please…run…” Cass lays his cheek on the stone floor, hugging his knees against the pain as millions upon millions of souls tear at his insides. “…warn the others…keep them safe…”
He gasps as his ribs splinter. “…please, Balthazar…” If he dies here, at least, he hopes, they die with him. “I-I can’t-…”
But Balthazar doesn’t run. He pulls Cass into his lap and holds him gently, laying his Grace over them both like a blanket.
“It’s all right,” he murmurs, soothing. “It’s all right, Cass. I can.”
how about a 6x22 au where cass imprisons balthazar instead of killing him, and goes to him for help instead in 7x01
balthazar stands with him during the second ritual, helping cass stay up with his arms around his waist. the rush of souls almost burns his hands right off, but it works
and afterwards, he lays cass down in bed for a nice, long rest