Cho pumped five or six shots into the door in frustration. Then he turned and walked across the hall to Room 204/ Solid Mechanics class. He was in for a surprise.
The class had been in high alert from the moment Prof. Liviu Librescu saw Cho, gun in hand, leaving the room next door, Room 206, about three minutes earlier. Librescu told his students to get to the back of the room while he kept watch by the door. Two male students had bolted for safety, only to wind up right in front of Cho, who shot one of them twice.
Back in Room 204, the students were doing what they could.
"Everybody just got down on the ground," said Richard Mallalieu, 23. "We used desks to shield ourselves. One of my friends (Alex Calhoun - ed.) called 911."
"Somebody went up to the door t…