pipe. whatever it was it s a deadly weapon. reporter: dunn told investigators he saw a weapon pointed at him, feared for his safety, grabbed his gun and fired. we have shots fired in the parking lot. the person firing has left. police say they never found a gun in the teen s red dodge durango. the only thing he had on his person was a cell phone and a pocket knife. and both of those things were in his pockets when he was shot and killed. reporter: at the crux of the case, why didn t dunn just drive off? he just had somebody threaten his life, display a weapon, try to exit a vehicle and say this is [ mute ] going down now. and for the first time in his life, he has to use a firearm to defend himself. reporter: so one thing that continues come up in court the fact that dunn left the scene, never calling 911. it was detectives who were able to talk to witnesses and found a license plate and that s
stick. but, sir, there there they re like we re going to kill you. reporter: davis sitting in the backseat was killed. his three friends survived. investigators say they found no guns inside their suv and that dunn left the scene, never calling police. cnn, jacksonville, florida. let s break down the case with cnn legal analyst and former prosecutor. paul, great to have you as always. people may not like the outcome in the zimmer man case, but compared to this case, zimmerman was a no-brainer. the cases really don t line up in any way. you play the prosecution. i ll play the defense. the main allegation of course is just what we just unpacked there for you in the story. my main defense is i had to make a decision to save my life. it was an immediate situation. i saw something, i did what i had to do to protect myself.
and i had my windows up. i can t hear anything he s saying, but it was a lot of [ bleep ]. and [ bleep ]. and then the music comes back on. saying he feared for his safety, dunn retrieved his gun from inside his car. then police say he fired four shots into the suv davis was in. as the suv sped away, police say dunn fired four more rounds. when you began to shoot, can you honestly tell us that you ever saw a gun inside that vehicle? i saw a barrel come up on the window. like a single shot shotgun where there is a barrel. i didn t see this part of the barrel. i saw that part of the barrel. it was either a barrel or a stick, but, sir, they are like, we re going to kill you. reporter: davis, sitting in the back seat was killed. his three friends survived. investigators found no guns inside their suv and that dunn left the scene, never calling