Honestly, I'd have no idea. It seriously just depends on the exact situation at the time, whether I run, try to disarm, or get in the car with hopes of escaping later (or immediately after we start driving). There's really no telling. I'd like to not be in that situation.
I got over my "I could take them" fantasies a good while ago, so now I'm pretty much aware I'd be unlikely to do much. I do know, however, that people tend to be awful fucking shots when surprised.