>> she just punched me like a dude in the face. >> with only seconds to react. >> i said, "you need to get the f out of here before i blow your fing head off." >> there's no turning back, and it's all caught on camera. "caught on camera: point of no return." an undercover surveillance operation quickly erupts into a violent shoot-out with one police officer in the fight for his life. >> i cannot believe that i survived something like this. >> john savedra has been a narcotics detective in miami since 2007. to crack down on the drug trade in miami-dade county, detective savedra and the fbi target grow houses -- anotherwise ordinary looking homes used to illegally plant, grow, and sell marijuana.