from the thread on corvette forums(although people where arguing over which story was true) A trans-am guy made a comment to hennessey about his shitty dealings and hennessey swung. Then the other guy beat his ass....hard!
The things in question were: One guy said TA guy threw hennessey in another guys viper while beating his ass, and as to whether or not the degree of asswhoopedness laid upon hennessey could have been construed as self defense or not. I think there's a link to the thread at 300zxforums.