just ask lloyd irvin. >> i'm laying on the couch. i wake up, and there's two gunmen holding guns over me, pointing them, holding them down, you're being robbed. don't move. >> more than six years have passed since that night in august, 2008, here out the nation's capital in a nice neighborhood in prince george's county, maryland. but lloyd and viy irvin and their son, just 4 years old at the time, are still haunted by the image of the gunmen -- two masked intruders. >> talk about worst nightmares. this is it. >> yes. something you would never imagine would happen. >> what the robbers didn't count on was that lloyd is a nationally renowned martial arts expert. and when one of the gunmen walked way to scope out the rest of the house, lloyd was suddenly one on one with his accomplice. gunman's over here in the corner. >> he doesn't have any room to back up at all. i just go. i'm coming over, i got the gun, trying to get the cartridge out. once i get it out, it drops. it hit the ground. >> where does the intruder go? >> he ran out of the