Pack’s physical ability and composure, Allen’s freefall rendezvous and equipment transfer, the camera jumpers, aircraft crew, and production staff all contributed to the stunt’s success.
Schmoll’s contribution was foundational: he created the hardware interface that allowed a man who began freefall without a parachute to receive one, connect it under extreme time pressure, and survive its opening.
That remains the clearest documented example of Schmoll’s technical abilities.