Irregardless of how one interprets the actions and intentions of the taxi driver, I still believe that pointing the gun at the taxi driver was excessive. Being a gun-owner, you must be responsible enough to assess the situation correctly. You have your foot on his car door, you draw your weapon to signify that you are ready to deal with any aggressive attack, PERIOD. You don't unnecessarily ask for an attack. The taxi driver can argue that because you pointed the gun at him, he has to attack and protect his life. Vicious cycle indeed. You draw your gun in self defense, you point your gun in self defense, he attacks you in self defense. Me saying that draw the gun and point it to the ground in front of him is actually signifying a stealmate, I've marked an imaginary line, which he should not cross. If he still does, I can justify self defense then. Slim chance of me being slapped by going overboard with my actions. I tried to neutralize the threat, by steps or levels if you may. My point is if one is privileged to own a gun, one should exercise maximum tolerance. The gun will always be the last resort.
No arguments here, to each his own really. I'm just imparting what I believe will always be the action when in comes to firearms. As to the fact that the guy was already initially injured using the knife of the taxi driver, then when he was already being attacked, he should have already drawn his gun in reaction to the threat. It probably started with a punch thrown by Benz driver, answered with a knife swing by taxi driver, followed by gun pulling by Benz driver. If taxi driver lunges for Benz driver after the gun was pointed at him, and both get to live and sue each other, the weight of the actions will fall down on Benz driver, most probably. Irregardless of who is a fault in the road incident, Benz guy probably started worsening the situation by alighting from his vehicle, approached taxi driver and probably pulled the first punch, hence taxi driver pulled out his knife.
It may not be how things happened, but definitely the path taxi driver's lawyer will take. And Benz driver's lawyers are already panicking by saying what was used was a toy gun. Airsoft? They'll be asking fir his permit for that, since you need one for it too. See, taxi driver's defense are already attacking and Benz driver's counsel are left to defend, hence you see whi is being showed now. Would have been different if he did not point his gun at the taxi driver and his gun, hopefully, is licensed with all the necessary papers. If that would have been the case, he can already charge the taxi driver for the injuries he supposedly sustained.