MSNBC Dateline October 13, 2019 06:12:00
>> reporter: from an early age, weldon mcdavid was passionate about protecting other people. >> i -- i used to protect my friends on the way home from school. we had a -- bully that -- tried and tried -- to start fights with us. and then i found out that a nicely applied arm lock would get that bully to kiss the street. and we didn't have to run from him anymore. >> reporter: when he grew up, weldon enlisted in the marine corps. after leaving the service, he worked as a firearms instructor. we met weldon back in 2013 when we covered the story of another woman he met at the shooting range. >> a...