Poor birds
As others said, a warm quiet stress free place to see if he can possibly pull through. If he is comforted by your voice, stay with him and keep comforting him with your words, softly and calmly.
Electroltyes for shock.
Treat injuries once he has calmed down.
I had a hen get attacked by an irresponsible neighbor's dog - she started out acting this way but I held her and kept talking to her gently and clamly till she came around and acted more alert. This took well over an hour. I brought her roo friend to her and this helped both of them. Then I got her to the vet.
JJ

As others said, a warm quiet stress free place to see if he can possibly pull through. If he is comforted by your voice, stay with him and keep comforting him with your words, softly and calmly.
Electroltyes for shock.
Treat injuries once he has calmed down.
I had a hen get attacked by an irresponsible neighbor's dog - she started out acting this way but I held her and kept talking to her gently and clamly till she came around and acted more alert. This took well over an hour. I brought her roo friend to her and this helped both of them. Then I got her to the vet.
JJ