Dude vs Shark

What would you do for your buddy?

Pick him up from the bar when he's had too much to drink? Help him move? Fight a shark for 2 hours?

http://www.dailymail.co.uk/news/worldnews/article-1161211/Pictured-The-moment-diver-grappled-12ft-tiger-shark-save-friend.html?ITO=1490