It's always safest to get a professional opinion, everyone has been right so far in saying that parrots hide their symptoms very well.
I think I got here a little late and you are probably at the vet already as I write this, but here is what I suggest you do (in the event that you are unable to get him to a vet right away).
Put him low to the ground in a calm quite room, preferably in his cage. Let him cool down, even mist him a little with a fine mist spray bottle. Point the nozzle into the air and let the mist fall down on him like rain. This will cool and calm him as well as rinsing some of that blood away from the nares.
If he is acting fine, and if you have rinsed the damaged area and see no serious injury, chances are he will okay in a few minutes. But yes, it is always a good idea to check with your vet.
For future prevention: I know this may go against everything you believe as a bird owner...but... I suggest that you clip your birds wings. Unless a bird lives in a large aviary or is flight trained by an expert, it is simply unsafe to keep your pet birds flighted. This is experience is the perfect example. I'm not saying that birds can't live perfectly safe and happy lives if they are fully flighted indoors, because the absolutely can. What I AM saying is that the bird owner needs to be willing to accept that risk of injury, loosing your bird, or even death increases by 200% (or more) if they choose to keep their birds flighted.
I'm not concerned with any moral debate of what is 'right or wrong' when it comes to the topic of flighted vs clipped. My point of discussion with bird owners is simply safety vs risk.
Another important point is that, contrary to popular opinion, wing clipping doesn't have to reduce the happiness of your bird. Most bird groomers over clip birds which makes them drop out of the sky like a stone. That is not what I am suggesting here at all.
I suggest a baby clip. This means only trimming 2 - 4 of the primary flight feathers (never touching the secondaries or back feathers needed for balance). This will give them the ability to still 'fly' but reduce the speed and height at which they can do so. Simply put, they wont hit things as hard (or at all) if they do get spooked like your experience today AND in the event that someone accidentally leaves a door or window open (heaven forbid), your precious feather babies wont get to far.
I hope this was helpful,
If you (or anyone) has any questions about this or similar bird topics I am more that happy to help if I can.
I hope coconut is feeling better already, all the best.
Leigh
My Birds House