As I understand it, if the bolt was not locked by rotating the bolt handle down, then there no way the extractor will be able to pull the round out of the chamber if the bolt is retracted.
So one question is if when the non locked bolt was retracted with the rifle in a vertical position (barrel up) would the round slide out of the chamber due to gravity, or remain in the chamber?
Certainly around would remain in the chamber if the rifle were held horizontally while the unlocked bolt is retracted yes?