I dont really know the situation, but for all i know, this could really be a proper gang.. Im mean, just cause you ride a sport bike, doesnt mean your a good bloke... and a harley means a bad bloke...
If it was a real gang, and im not saying it is... I dont know what Id do with a whole gang surrounding me with my wife and kids in the car.. Id probably gas it too I recon.. If they think they can do whatever they want and attack me, you can be sure im gonna do whatever I can to protect myself and my family..
Moral of the story I recon is, if you are gonna intimidate and threaten someone, be prepared for a full scale retaliation, as the victim doesnt know what level of violence may come at them, so they will react will 100% force available to them.
Bikers didnt even know who they were dealing with.. Dude in the car could have pulled a gun and wasted a stack of them!
TLDR: What cordogs said.. ha ha....