Dipper looked up at his sister helplessly, who was choking, it seemed, on air.

"PUT HER DOWN!" He yelled up at the evil triangle who was smirking down at him.

"Why?" The isosceles beast challenged, squeezing air tighter in his balled fist, Mabel's spluttering getting louder. Dipper glanced at her, sickened, as she floated in the air, flailing her arms uselessly, trying to shake the inevitable, invisible force off her throat.

Dipper turned back to the yellow demon and worry filled his eyes and was eating away at his soul. "P-please..." He begged, whimpering. "Please let her go..."

Mabel's face was pale, her eyes bulging as she gasped for breath. Bill cackled malevolently and shut his fist harder.

Dipper looked at his twin solemnly. "Mabel..." He whispered so Bill wouldn't hear. "I'm sorry..."

Mabel's eyes grew wide as she realized what her brother was about to do for her. "No..." She managed quietly, coughing slightly. "Dipper... d-don't..."

Her twin smiled weakly at her and looked up at the dream demon levitating above him. "Fine, Bill," he muttered. "I accept."