released a statement overnight saying she is actually in a coma, remaining in critical condition at a local hospital. meanwhile, investigators have been looking into the details around this shooting all weekend looking at surveillance tape, and they say it's very clear that this rampage could have been a lot worse. >> the school is in lockdown, i'm not sure why. >> reporter: dispatch recordings, police rush toward arapahoe high school following reports of gunfire. >> be advised at this time we have one student down and they have found shotgun shells. >> it was terrifying because we heard gunshots. >> reporter: 18-year-old karl pierson entered the school investigators say bent on revenge. >> everyone saw him realized he was armed with a shotgun. the individual also had a bandalera of multiple rounds of shotgun ammunition strapped across his body, and he was also armed with a machete. >> reporter: pierson's target his debate coach, tracy murphy.