Its really not good this guy's book is making claims like this in a pending case like this.
Whether the case is if he misunderstood Zimmerman, Zimmerman exaggerated that part to him, or he flat out made that part up to sell books...its a bold claim to make at this point in the game.
I suppose the important thing here is Zimmerman himself never said that. I doubt Zimmerman would have been in a position to even get enough leverage to get the gun away from Trayvon if he did manage a firm grip on it.
Quite honestly, in a self defense situation it shouldn't really have to come down to getting beaten into a near vegetative state, or having to wrestle a weapon away from someone....