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I don't know if a safety hole is a good idea. If you know it has internally pipped into the air cell, then making a safety hole over the air cell can ensure that the duckling can breath in the interim between internal and external pipping. But if the duckling is on the wrong side, if you try to...

It could be that the duckling is facing the wrong direction, tried to pip on the left side, and hit a blood vessel (thus causing the dark bruising you're seeing). Are you seeing any movement or hearing anything?