Yikes! That is alot of blood, I would not touch this one.
I do not help them unless I think its something I have done to screw them up, like opening the bator to take out the chicks that hatched the day before and even then only if they have a big chunk of shell already gone and they are getting shrink wrapped.
If they are just late to hatch I let them go a few days, there is no harm in letting them sit in the bator for a few extra days.
I have had the same hatch where chicks hatch on day 20 and some on day 23.
If they are slow developing for whatever reason I don't touch them, if they hatch they hatch if they don't then they were not meant to.
After day 23 I toss them out without opening them.
The ones I have helped out have gone either way, one is running around the yard, a full grown cochin rooster and another died right after hatching.
The only time I have interfered is when like I said I opened the bator to remove chicks and the ones that were pipping started to get shrink wrapped and they had previously been actively hatching out.
I realize when its shrink wrapped its my fault and screwed up the humidity but any other reason for them not hatching I leave them alone.
I learned to not open the bator ever during a hatch if any of them are pipping so I wouldn't be put in the position where I have to help one out because I messed up the humidity.
Even though you opened the bator to add water it was not a factor here, this chick just wasn't ready to hatch,
If you had messed up the humidity you would have seen the membrane wrapped tightly around the chick, literally shrink wrapped all the way around.
This one should just be left alone at this point, if you continue to help it out it will die.
It may have hatched on its own, just later than the rest, its just not ready or it may have been to weak and not meant to hatch.
The chick not hatching was not because you opened up the bator to add water it just wasn't developed enough.
Sorry for your situation, hatching is a learning experience for sure.