We are on day 24 (25 starts in 4 hours) and 4 chicks hatched at day 20/21. I decided to go ahead and assist to see if any were still going to hatch. 6 were quitters early on, but these 2 I'm not sure. One is still alive and it was moving and poked at the membrane (one on the right). I'm not sure about the one on the left tho. They are in the incubator on a wet paper towel with high humidity.
See if you can search shrink wrapped chicks on here. I was reading about this on this forum but can't remember where. I think it may be the problem. If they are at day 24 I think you may need to help them.
Stop at the first sign of fresh blood tho.
I am fairly certain the bottom chick was a late stage death. There is no movement and a free moving fluid around the bird. The top one doesn't have that free moving fluid, but the vessels are full of blood still.
If there is a lot of yellowish fluid around the bird it probably wouldn't have survived to hatch. I can't remember the name of the fluid
but it is caused by bacteria entering the egg at some point. If the vessels on the other one still have blood it would be best to wait.
This egg is the one I think is dead. The other one's membrane clouds over and has to be wet to see through. This one always looks like it does in the picture. I've seen no movement and it has a a liquid that moves around under the membrane when the egg is tilted.