Your duck egg is externally pipped on day 25? Were your temps running high?
The duckling will need more time to hatch since it's emerging from the wrong end...plus, day 25 is early. Should you decide that intervention is later needed, @Pyxis's Guide to Assisted Hatching for All Poultry is a great resource. There's a section in there specifically about pips in the wrong end of the egg.