@FunnyfarmMidwest had an egg that tried to pip on the wrong end like this resulting in a bruise. I'm not sure if she found the bruise too late or not. She has experienced this though
@MGG has helped me get through many obstacles in hatching
Pyxis wrote the article and will know what to do. She and casportpony worked together on this I believe (at least she provided a lot of the pictures) and both of these ladies are incredibly busy and not available to reply often but maybe they'll have a moment to reply about this "early pip on the wrong end for a KC that resulted in a bruise"
Edited to remove tags since this awesome OP has already taken care of it