The paratrooper manages to open the reserve parachute shortly before hitting the ground.
This video was filmed during the Anakonda-16 exercise in Poland. It shows a Polish paratrooper reacting to a problem with his parachute after a jump from 400-500 mt from a C-130 Hercules: the main chute fails and the Polish Army paratrooper has to deploy the reserve canopy that saves his life.
The mishap occurred during an airdrop operation that involved U.S. paratroopers from the 82nd Airborne Division, British soldiers from the 16th Assault Brigade and Polish Army military from the 6th Airborne Brigade who jumped over Torun, to simulate the take over of a bridge over the Vistula river.
H/T to KaBe. for sending this over to us