Yep, Slayer were always scheduled to be out and off at 10:50. I was thinking that might have been due to a long drive the following day, or the fact that the Warped tour was coming in later that night, but I guess it's just a shorter headlining set due to the 'festival' nature of the show.
I was there, hanging around by the gate.....but since security wouldn't let my friend Ripper in, we cut our losses ($10 to park? Hrm.....) and left toward the end of CoB's set. Besides, our tickets pretty much sucked; Row SS, Section 206.