Chances are that if one egg is wet like this, other ones will be, too. So you have a few options... Let things be, in hopes that they survive, or make a small observation hole from the top of the egg and try to see how wet they are. The humidity in your incubator will have to go up a lot and you will have to monitor every egg for dry membranes. However, if they are all as wet as this egg there is a good chance they will drown. Also, they may be weak and simply die. It's hard to say. Call ducks are hard to hatch to begin with because many of them have issues with pipping. Is the little guy moving around a lot, breathing? What may look like absorption could be him dying; in which case, so long as he didn't lose a lot of blood (think: blood gushing), probably could not have been prevented... Just keep him warm and make sure he's still moving / breathing if he is breathing.
As for the others... It is a gamble regardless of what you choose to do, so it really depends upon what you feel most comfortable with at this point.
As for the others... It is a gamble regardless of what you choose to do, so it really depends upon what you feel most comfortable with at this point.