http://radiolegendary.com/2015/06/mystery-lady-lawyer-breaks-legal-logjam-in-bond-reduction-hassle/
[Attorney] Looney revealed that his clients, a couple named English, William and his Morgan, were arrested as they arrived late at the Twin Peaks meeting following their ride from Brenham. A disturbance broke out, and hearing gunfire, they took cover. They were looking forward to a day of fun with fellow motorcycle enthusiasts when they unwittingly ran afoul of the law, local police, deputies and federal officers hell bent on rounding up “thugs.”
English is a Marine veteran of two tours of duty in Iraq. A nine-year veteran worker at Valmont, he and 160 fellow employees were recently laid off. His severance pay has been terminated because he hasn’t been able to check in since his arrest, according to his attorney.
Looney recalled that English said, “I heard two pops that sounded like small caliber gunfire, “Following that, I heard several bursts of assault weapon shots. I recognized the sound because I carried one of those weapons for six years as a marine. That’s all the gunfire I heard. Then the police started screaming ‘Get down!’”
I don't know if this source is reliable, or if the witness's statement was recounted correctly. But, it's an interesting account that might explain what actually happened.