Can you post a photo of the roosters face?
You mention that he is having trouble breathing - is the hen also having any difficulty (wheezing or rattles in the breathing)?
For the wound on his comb, just rinse it a little with saline and apply a triple antibiotic ointment. Do you think this was from fighting with other males or could it be a predator attack? Check through his feathers for any more wounds. If his nostrils are clogged with blood, see if you can wipe them out and if that makes a difference in his breathing.
For your hen --- is that dried mucous in her nostrils? Can you gently open the eye, look at it, then rinse it with some saline? She looks like she may have had a discharge at some point from the eye, it's hard to tell. Also the beak (where the arrow is) look inside - are there any lesions or plaques inside? In the photo it looks like she is open mouth breathing - is that right?
Have you had any sick chickens lately with respiratory illness or have you introduced any new chickens within the last 30days?
Keeping both of them both warm and hydrated is the most important thing to do at this time. Both may be in shock. Once they will drink on their own, then offer food.
Antibiotics may help, but a lot depends on what has happened. If you have a vet that can take a look that is always best.
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