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When the game is too easy to require cooperation and the rewards of competition too few, one falls back to dickery. Ever play 4 swords? The best part of that game was throwing people into fenced areas or just off cliffs. When the co-op is engineered around warm bodies and not skill the need arrises to differentiate oneself. It's all about creating memorable moments, and standing there holding the lever while your friend walks through a door will always lose to dropping the door on his head.