Other synonyms: absence, bankruptcy, blemish, damage, debit, decline, defect, defectiveness, delinquency,
If the blow were to say break his nose that is serious bodily injury and now you are looking at a Class B felony, Assault 2. If the blow was still serious and resulted in bodily injury but not as serious as an Assault 1 or 2 then you have a Class C felony, assault 3.
The part in the back of the septum is made of bone. Whenever the septum is crooked to a significant degree, your nose can be stuffy, and a septoplasty can be offered if medical therapy doesn't work. However, having a crooked septum doesn't mean that you'll have a stuffy nose, or that you'll need a septoplasty. No one has a perfectly straight septum.