There are also hereditary conduction disturbances that make someone much more vulnerable to this situation. They are asymptomatic and difficult to detect on routine EKG (like Brugada syndrome, prooonged QT syndrome etc)
About fifteen years ago, I watched an opposing player in my son’s lacrosse match die from SCA after taking a mid-chest hit from the ball. He was fine for 30 seconds, and then his number was up. Sad, but true.