Lessons Learned From Analyzing 50,000 Gunfights. This is an updated version of this popular lecture presented by the YouTube creator John Correia of Active Self Protection. This seminar will distill thousands of gunfights and other defensive encounters caught on surveillance video for the most significant attitude, skills, and plans self-defenders must focus on to prevail in a defensive encounter. This is an evidence-based approach to self-defense that everyone can learn and benefit from.