P.c. 243 (a) battery What will happen at court if its his first offense?

My husband has ptsd and anxiety/panic disorder. A month ago we were harrassed by an individual To the point of him stalking us. Well a week ago he confronted us got loud with us my husband in the heat of the moment felt he was in danger and pepper sprayed the individual. He missed but got the side of the guys face and clothes. Yet this individual started saying he was going to take his life etc. Both parties called police and my husband was told to walk away from the individual but the individual kept following us and yelling threats. Yet my husband was the one cited. My husband has no criminal record he just felt the need to defend himself. My question is what happens at court should we get a defense lawyer will my husband actually go to jail even though his mental illness played a huge factor in what happened. Any advice will be helpful thank you.