Unsure if chick inside egg is alive

[LM24]

Sorry this is a pigeon egg rather than chicken. It was brought into rescue after the nest was accidentally destroyed. I candled and it looks almost ready to hatch - shadow of the chick, clear air cell and I could see strong thick blood vessels. No movement but I only candled very briefly and the egg was a bit colder from being out of the nest.

But the shell is a greyish colour I'd usually associate with rotten eggs about to explode. And now I've noticed an expanding crack with orange fluid leaking out. Is this likely from decomposition or is there any chance something may be alive in there?

Thanks in advance

 

[LM24]

Also to add - no obviously strong smell before I put it in the incubator. I haven't lifted the lid since putting it in to check the smell.

We think we've seen it moving ever so slightly in the incubator - like a tiny wobble/quiver ever now and again - can gas from bacteria build up do that?

 

[CloneFly]

Gas might be able to do that, I'd give it a little time to see if it's viable. @CCsGarden what do you think?