This is a cleo which simulates the Last Standing mode from one of the best third person shooter, Max Payne 3!

What it basically does (for people who never touched MP3):

When you lost 3/4 of your health, time will slow down and there will be a dark vision. Then you can to shoot the NPC with a big red marker on to death for getting your full health back. Otherwise after 3 seconds you will die instantly :p

Check the video for more detailed information ;)

It also works for android, just change .cs into .csa