I think at this point all you can do is keep the inner membrane moist and wait until the blood vessels recede.
I've used canola oil and Vaseline to keep the inner membrane from drying out, applying very tenderly on the exposed surface. As the chick moves around in the shell struggling to get out, the blood vessels will slowly recede. Don't peel back past the air cell or you can cause a hemorrhage very easily. Let time help the chick prepare for life outside the shell. It's hard to wait, but forcing it out before it's ready is just as likely to result in death as the chick being stuck in the shell.
I've used canola oil and Vaseline to keep the inner membrane from drying out, applying very tenderly on the exposed surface. As the chick moves around in the shell struggling to get out, the blood vessels will slowly recede. Don't peel back past the air cell or you can cause a hemorrhage very easily. Let time help the chick prepare for life outside the shell. It's hard to wait, but forcing it out before it's ready is just as likely to result in death as the chick being stuck in the shell.