Yet another way skydiving can go wrong.

On the list of potential hazards to be worried about when jumping out of a plane, “having a seizure in midair” isn’t the biggest worry — and yet, that’s exactly what happened to Christopher Jones of Perth, Australia.

In this video, you can see Jones suffering a seizure while in freefall. Thinking fast, instructor Sheldon McFarlane, equipped with a helmet camera, raced to his aid, stabilizing him and deploying his parachute at around 4,000 feet.

Miraculously, both skydivers — and the footage — survived.