It is likely it just happened to pip through a blood vessel. I'm so sorry - but it is one of those things that isn't anyone's fault & doesn't mean there was something wrong with the baby. Just bad luck.

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I am not sure how this happened? and there is blood dripped on the side of the bator too? never had this happen but that chicks membrane looks VERY ODD... please read this article https://www.backyardchickens.com/a/step-by-step-guide-to-assisted-hatching
thats so sad. But dont let that discourage you from hatching more!Well, that little chick died in its shell shortly after it lost all that blood, but on a good note I do have 8 thriving chicks and still more to hatch!