classroom of this high school, so many high schools in america. students talking about how that training kicked in. they barricaded inside the classrooms, they got under their desks, they tried to take cover. we heard one student earlier tonight on cnn, don, talking about how students were trying to arm themselves with scissors and calculators. >> alex, we're going to go now to the sheriff in oakland. this is the undersheriff, michael mccabe. let's listen in. >> you guys all set? >> just a reminder again, if you have any phones or anything, please silence them, because this is streaming, and it picks up every little bit of noise, so