Both times that I had to draw my weapon law enforcement was called. I simply told them what happened. They checked my CHL, took a repoert, had me fill out a statement. Then returned my gun, and sent me on my way.
Shots were not fired on either occasion. Cops looked for suspects afterwards, and told me I would be notified if they found them. I have not heard anything back since.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.