Maybe make a very small hole in the top to see what's going on, but not more than that. I wouldn't be surprised at all if you see that it had been bleeding. Hopefully the bleeding stopped and it didn't hit a major vein or anything like that.
It looks like bruising to me, like the duckling might have nicked a vein when internally pipping so there was some bleeding. Hopefully it's fine in there.
This is a chicken that is internally pipped, not a goose, but it will look very similar. You will see a moving shadow in the air cell that's fairly triangular in shape, and that's the beak.
Have you read Pete's incubating and hatching guide for geese? It's a very great resource and walks you...
Lockdown for goose eggs will actually vary from egg to egg. Larger eggs tend to take longer to hatch. What I do is watch for dip down, when the air cell starts coming down the side of the egg, as that signals that the gosling is preparing to internally pip, and that's when I lock down. But, you...