We're all ignoring the possibility that the pilot gave him the, "Now if I become incapacitated," speech before taking off.
If I kicked off in flight on day/good weather, and she was up front, I’m pretty sure that airplane would end up inside the airport perimeter, probably stopped on all three wheels on a runway. That’s not to take anything away from this pax feat, but it’s pretty likely they at least had a pretty good idea of how things work. (And were in a fairly simple airplane.)