6'5" peddler approached my wife in a Walmart parking lot 2300 hrs. Nov 2018 ,he didnt see me and when he saw me,' i did " STOP" motion and body posture of " being ready to respond". because of info about situational awareness form USCCA , i remembered what to do. maintain eye contact, scan the environment, ready to protect family. i was in condition red already, yellow to red took less than 5 secs.