The chick has turned in the egg...

[BirdsBeesTrees]

I have fully assisted and slipped the chick under the hen to fluff up and get warm.

 

[MysteryChicken]

The foot is in the air hole. I would at least make the hole a little bigger.

Yes, I see that.

 

[Tonyroo]

I would think it's harder to assist an egg if it came from a broody hen.

Once you remove the egg from her, evaporation/drying out occurs instantaneously causing the chick to be shrink wrapped and putting pressure on the remaining blood vessels that surround the inner shell.

Just a thought.