Another photo - will this chick need assistance?

[TempletonPeck]

Hello (yet again!)
So this is a day 19 (soon to be day 20) shipped buff Orpington that seems to be happily moving around despite the oddness of its environment.
Is that vertical straight edge part of the air sac? There is activity right at the obvious air sac end of the egg as if the chick is pushing against a membrane there, but that straight line is odd.
I can’t see this one surviving unless I assist - what do you all think?

 

[Chickens are awsome]

can you see veining? It almost looks like it died to me.
Because at data #19 they should take up almost the whole egg

 

[TempletonPeck]

I know exactly what you mean - the egg should be full - but there’s not even veining across that half empty section. The chick, however, is definitely alive, and, as it’s starting day 20 in half an hour I’m wondering if an assist is the only chance it has.

 

[TempletonPeck]

Update: because of the tiny air sac at the tapered end, I put a safety hole in there… and, within an hour, the shell membrane was being tampered with from within, exactly underneath my safety hole!
There does seem to be a thick second membrane underneath the shell membrane, but completely white. The chick has pierced this but I wonder if this is what is squashing it so it occupies only half the egg.
Do I assist?