I decided to help it out. I've bred parrots in the past, so I know alot about zipping the shell and not the membrane, so I felt confident that a chicken egg wouldn't be much different.
I put the egg on a warmed towel on my lap and began chipping away along the shell without hurting the membrane. The membrane was moist, but not too wet, so I didn't worry that it was too tough for the chick to get out. As I chipped away slowly, I spoke to the egg but got no response and no movement.
Once I had zipped all around the shell, I put the egg back in the bator and waited. Nothing. So, after about an hour and a half or so, I took the egg back out and gently began working some of the membrane. The chick fell out onto my hand but was still.
Yolk sac not absorbed, but fully formed little all black chick with black legs and beak. Poor dear.
I knew going into this that I was bound to run into heartache eventually. Sigh. Do you think there was anything I could have done differently? I keep thinking I should have helped him out last night when I saw him working so hard to get free. Darn. Its really hard though not knowing the real hatch dates on these eggs. Wish my neighbor payed a little more attention to things like this.
On a good note, the little blue/green egg that was only slightly pipped last night, has now got quite a good bit of zipping done too! I've seen the beak (black and yellow) peaking in and out and I've been peeping at it to incourage him/her.