May be transmitting to ATC with proper terminologies was learnt by watching the pilot do it? I assume there's not much to do as a passenger in a small aircraft like Cessna 208?

Btw, This got me curious and looked into Rowan Atkinson's (Mr. Bean) similar plane incident[1] where he supposedly maintained control of the aircraft mid-air when his pilot was incapacitated and the pilot recovered eventually to land the plane. All information on this incident points to Rowan not having any prior flying experience.

[1] https://en.wikipedia.org/wiki/Rowan_Atkinson#Plane_incident