The Marines have been trialling the techniques for recovery of parachutists. They fly rapidly rearwards with the "mouth" open, the rear rotor cuts the shrouds, and the parachutists are gobbled up by the rear cargo door.
On this occasion, with the copilot flying by leaning out the crew door, they left it a bit late and almost lost the parachutists into the water. The senior parachutist can be seen strangling the person who talked him into doing this.