Subject: A moral 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.

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:
.
.
.

.

Which lens and shutter speed would you use?