And the "he rescued a family" quote sure fits the George Zimmerman Is An American Hero narrative that some people like to spout. Naturally, people who applaud him for killing Martin are going to take the official story (there were others helping before paramedics arrived, and he's only been reported to have pulled one of the individuals out of the car) and turn it into a single-handed hero type of story.
So let's take the "Zimmerman is a cold-blooded killer" and the "Zimmerman is just such a good guy" bull**** out of the equation and look at it this way:
I was in a car accident once. I didn't roll over, but the truck that t-boned me caused me to do a 180 while I slid into the ditch. I was perfectly fine, but even then the off-duty cop that was the first to my car advised that I not move until the paramedics arrived, just in case there was a neck injury that I couldn't sense due to the adrenaline. Again, this was in a non-rollover kind of crash. Now, I'm sure that a reasonable person could look at a group of people in a car accident, and reasonably decide that it's okay to pull them out. But it's still probably good practice to make sure that the professionals take care of it, in case there is a problem (unless the **** car is on fire, in which case I have to agree that you do what you can instead of twiddling your thumbs).
So, in short, George Zimmerman did the exact opposite of what a first responder would tell him to do, which is the real story with that guy. More than any bull**** about him being some vigilante hero or any other bull**** about murdering Martin in cold blood (we should all get it into our heads that Martin did nothing to deserve being stalked by Zimmerman, but he really didn't make the situation any better by getting physical with him)... he seemingly just has a personality that makes him want to play hero, despite those moments when common sense or a 911 operator would tell him otherwise.