Drone loses one propeller while flying in the Dolomites... Italy Alps Nature footage. Drone crash.

Reginald was happily cruising in the mountains and suddenly fell with only three props on. I immediately thought it was an ESC de-sync but my spotter told me he definitely saw something black flying away (as Gopro did as well). Always verify your pre-flight checklist boys, don't be foolish. Everything was relaxing until the crash