It hurt in a way Cartman couldn't comprehend. And for that moment in time; that brief, insignificant blip that wouldn't even register on the radars of the universe; he understood. He and Kyle knew each other more than they'd ever really been able to grasp, and their antagonism fueled them, brought life to them both. Even if they couldn't stand each other right now, Cartman had a brief glimpse of the future as he looked at his technically dead companion. One day, they would be friends.
His lip trembled. It went beyond that stupid contract. Oh, sure, that agreement would have to be upheld on principle, but it wasn't the only reason Cartman had to save his friend. After all, anyone could perform the unspeakable – and somewhat embarrassing – acts that were outlined in the deal. But losing Kyle... Losing that constant source of conflict, that stability – Hell, Cartman would even say sometimes that Kyle served as the set of morals he never possessed – would be too much to bear.
"Zap him again!" Cartman shouted. "Do it!"