The rest of the flock it stress other than braggs raw apple cider anything else help them recover?
The following is a link to a blog, with graphic pictures, of the healing process from a fairly severe wound.
Perhaps their experience will be helpful for you.
As for the flock, when stressed I give a vitamin/electrolite/probiotic in their water. Rooster Booster or Save-a-Chick.
It took about a week after a hawk attack for my birds to return to 'normal" behavior, but mine are permanently more wary, which I think is a good thing. My rooster alerts easier, and everyone charges to get under cover pretty easily now. They are just more easily spooked. It's a pretty traumatic event for them. I have both a covered run and an open run, and they have access to cover all the time. I also don't let them out into the open run until later in the morning now. Hawks can attack at any time of day, but mine seem to be more active in the morning.
I can usually tell, just by where my chickens are hanging out, if a hawk has been around.
Hope your bird recovers!