This is the endurance exam. Before this component, the potential fighter had to run for several kilometers with full gear, crawl, and do other physical exercises. This is the final component where the student must be able to protect himself for 4 minutes (even though he is in protection gear). If the student is down on the ground for over 5 seconds, he fails the exam.
The people who are examining the student are already qualified soldiers who have passed this examination previously.