My Partridge Plymouth Rock hen is my first hen to seriously attempt brooding and I heard 3 of the 5 eggs chirping yesterday and today one had pipped and taken a decent amount of shell off the egg. The broody got off the nest though to run around for about 20 minutes outside, I was a little surprised because I thought she wasn't supposed to get off once they started hatching. She is back on now and occasionally talking to her eggs, but the egg that had pipped the chick wasn't chirping or moving... I didn't see it breathing, it was just really still and it's beak was closed (it pipped in the middle of the egg and I could see its beak). Should I be concerned? I know they are supposed to rest a lot while attempting to get out, but I was surprised not to see any motion, almost as surprised that she got off the nest while one was trying to hatch.