Sorry, I went to bed and didn't respond. It sounds like the chick is hatching now but for future reference, for those who asked, the reason you want to go in through the rounded end of the egg is because of the air cell allowing for a more accessible area to apply ointment with a much lower risk of causing a bleed if you find you're assisting a chick that isn't ready yet. You can monitor the absorption of the blood vessels from the air cell even if the chick is upsidedown in the egg and proceed with assisting once you're positive it's ready.
Here are a couple of pictures for examples.
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