Duckling 1 but humidity is decreasing

[jjmoeller]

Hello everyone, I inherited three (mallard) duck eggs (it's a long but cool story) and one has hatched! The little guy is out and waddling around the incubator. After week 3 candling we didn't feel one egg was alive but it's still in there just in case. The other candled fine and we are patiently waiting. The little guy is almost dry (couple more hours) and no sign of hatching from egg 2 but the humidity is decreasing. It went up to 70% after he hatched and now is down to 55%. I'm told to not open during lockdown but I'm getting worried for the other egg that needs more humidity. Help!