Luckily, I did not have too. I was at Walmart just a little while ago, and while loading my stuff in the car I heard what I thought was a woman screaming for help. I turned and two rows over was a man in a white shirt who had a kid no older than 10 or 11 on the ground. I immediately ran that direction, to see blood on the pavement and the man driving his elbow and arm on the childs throat. I instantly screamed to get off of the child, and drew my Glock 26 taking aim. The man lifted enough to present a clear shot on his chest, keeping his hand on the boys throat and told me to "back off". I warned the man this is your last chance get off of the child or I'm going to shoot you. The man began to yell back so i screamed "LAST CHANCE MOTHER *****". The guy let go of his wrist and i held him there for police. Turns out the guy was some idiot loss prevention officer, plain cloths not that it matters one bit. The kid was accused of stealing, which he had not done. He was going out to the car to get his moms purse for her. The police thanked me, made some random comments about next time shoot him, and ultimately arrested the man for aggravated assault on a minor. Glad it didn't have to go the other way.