Opps! I forgot, in addition to the syringe method of getting digestive into the bird, you can also add to a soft food, like cottage cheese (diluted) and serve it up, if the bird is willing. Sorry about that!
I was wondering about that sack that looked to have green fiber in it? Was this the crop? and if so, was that undigested food of some sort? Perhaps it was sour crop or an impacted crop?
I have treated my chickens with this problem (it will feel like a hard golf ball in the chest area?) with my...