A moral question...

Think seriously about how you would answer this question.

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. You are a photographer getting still photos for the CNN news service and are 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:

Which lens would you use?