>> reporter: it's likely the hardest lesson bob rucker has ever had to teach his students. >> i lookt the student faces today, and i could see horror, sadness, and this, you're kidding. you want me to go into this profession after this? >> reporter: a day the former cnn reporter said he never thought would happen, shot and killed by a disgruntled colleague on live television. their final movements giving those in, and who aspire to be in the profession pause. >> you talk to them as humans first and let them know, yeah we don't have a superman s on our chest, so we have to be more aware now that society has changed. >> reporter: even in the bay area, last month robbers targeted two tv news crews in san francisco at gunpoint on live tv. i was asked to share my thoughts on a profession jolted, used to the war zones and riots, but not this. >> it was just a small little feature that they were doing. that's not something that you would assume would be threatening. >> after seeing this, i maybe think, should they have some type of security or protection with them? >> reporter: as we proces