Glad you found that out. Many years ago as a kid my dog teddy was hit by a car. There was damage done to his sinuses which made his nose crooked. There was a incident while healing he had gotten air stuck under his skin and he blew up like a balloon. The vet had to bandage wrap his body to decompress the air - the weirdest thing it never happens again. The only thing he had was a crusty nose and his nose was slightly crooked like your boy from the impact to his sinuses.