Sayid vs. Keamy, plus Richard Alpert

In probably the best fight in Lost history, Sayid takes on Keamy. It's a brutal fight which is highlighted by Sayid stabbing Keamy with his own knife. Sayid also attacks Keamy with a tree branch before the situation changes and Keamy pins Sayid and attempts to choke him with the branch. Sayid appears to be struggling to breathe when Richard Alpert steps in a shoots Keamy numerous times in the back, seemingly leaving him for dead. Kate uses Keamy's bloody knife to cut Ben's hands free from the restraints.