The chick that made it out with a little crustiness on it should be fine, that residue isn't a big deal. If the ones left in the bator are drying out then you need to mist some warm water in there, quickly. You can run the shower again to raise the humidity in the room itself, lift the lid a little and check the others. Manually moisten them if need be, fill the wells, put a wet maxi pad on the floor of the bator, mist the inside of the bator with warm water, whatever you need to do to keep them from drying out. Once the membranes are moist enough they should all pop right out.