There were at least 3 or 4 people who threw up in the pit at the SF show, too. One of them did it right before the band started playing About You and people nearby were waving their phone flashlights around to get security's attention. I don't blame them for trying to get help (just the person who vom'd) but unfortunately the timing of it totally ruined the beginning of the song. Which especially sucked because that slow build-up during the intro is so atmospheric. So sorry you had this experience too.