One important thing to note is that the Shadow 2 does not have an "automatic firing pin block safety." This is according to CZ, as the pistol was built for competition, not defense. That "half cock" hammer position is the correct place for the hammer to be when the pistol is not cocked and locked. If the hammer is resting on the firing pin and the pistol is loaded, a sharp impact could send a round unexpectedly.
I have run a Shadow 2 for almost a year now in 3 gun, steel challenge, club action pistol matches and a couple of classes at Sig Sauer Academy in NH. I have never had an issue with it. It is either loaded, cocked and locked or empty.
Sauce link below...
https://www.czub.cz/en/blog/2016/03/14/cz-shadow-2/