You must kill the person below you, but here's the catch. You must do it creatively.
Ready....GO!
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I'll kidnap the person below me and lock 'em up in a barren, nigh inescapable shed. I'll leave them to starve for a bit, then throw in a sandwich (really just a raw piece of meat between two slices of white bread) and a bottle of water. Both items are chock full of tiny, flesh eating parasites. I will not supply them with any more food, though I will give them a new, infested water bottle every other day. Let's see how long they last. ( ͡° ͜ʖ ͡°)