All you can really do at this point is make sure the beak is clear under the pip. For me, I've had a lot of malpositioned eggs zip fine on their own. Some can't, though. So just give that guy some time and see what happens. When the chick pips directly through the membrane and not into the air cell that pip is actually their "internal" pip, so those eggs can take twice as long since they skipped a major step. I would say if there is no progress after 24 hours from now, you can peel a tiny bit of shell away, being careful not to rip the inner membrane. Then moisten the inner membrane and check for veins. You can also keep an eye on the veins by candling the air cell end and the pointy end. All of the veins (and the yolk) need to be absorbed before you can offer assistance.
