Amanda Alvear, 25, was posting videos to Snapchat documenting her fun night out at Orlando's Pulse nightclub—and ended up recording the beginning of the terror there early Sunday, the Guardian reports. In her final video, more than a dozen shots can be heard ringing out in the background. Alvear, who was killed in the massacre, does not appear to panic at first, TMZ reports; others who were at Pulse at the time say many clubgoers initially thought the gunshots were just part of the music. (More Pulse Orlando shooting stories.)