Don't feel bad... you meant well. We just learn from these experiences. I had to help my 2 ducklings this morning after 50+ hours... They stuck to the membrane and could not roll so they could not zip. I saw no vessels so I zipped for them and let them finish the pushing. Hope I did not ruin their legs by not letting them try any more time...Well...the chick with the egg I pipped isn't doing so hot. Its starting to click when it breathes...but at the same time its more active. It looks to be struggling and like it wants zip but I think she's a goner. She is just in a weird position I don't think she'd have made it either way but I definitely opened it too soon. The other egg is shaking and hopping and chirping away, its pretty vigorous...although I'm surprised because its been a long time too. It has a way stronger chirp than this other one ever did. The opened egg starting chirping yesterday and it was very weak sounding and then never chirped again in the egg. So after 30 hours from the initial chirp I pipped it because I had read on another thread 24 hours after internal pip they run out of oxygen. I think that is wrong. I should have given it more time...but maybe it wouldn't have survived regardless. I just don't know.
If there are survivors, we want to see them!!!