You must kill the person below you, but here's the catch. You must do it creatively.
Ready....GO!
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Guardian Gary. I will lead you back into an alley where I have hidden a trap door. In that trap door there are killed snails that slowly cover you in their slime that eats your flesh away. You can't climb out because when you fell in you broke an arm and a leg. You can't call out cause I covered the hole with a big metal plate and then re-tarred it. You will either suffocate or be eaten by snails.