Not sure why the dad would be "dead meat". He said he had a permit for the weapon. There's no reason to not believe him.
How many witnesses are going to be truthful about the situation. ZERO! Everyone will be lying (him included) and he will be all alone. He is toast. This is going to cost him 10s of thousands of dollars. He should have got his daughters and got out of there. Unless you are Hulk Hogan you aren't going to buffalo several dozen drunk frat boys. They are in their element and it has been my observation over the years they will fight when they out number you at least 4 to 1. Here it was probably 25 to 1 and that is what it will be in court.