"I have a moral question for you" joke

I have a moral question for you. This is an imaginary situation, but I think it is fun to decide what one would do. The situation: You are in the Middle East, and there is a huge flood in progress. Many homes have been lost, water supplies compromised and structures destroyed. Let`s say that you`re a photographer and getting still photos for a news service, traveling alone, looking for particularly poignant scenes. You come across Osama bin Laden who has been swept away by the floodwaters. He is barely hanging on to a tree limb and is about to go under. You can either put down your camera and save him, or take a Pulitzer Prize winning photograph of him as he loses his grip on the limb. So, here`s the question and think carefully before you answer the question below:
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Which lens would you use?
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