HOUSTON (AP) — Luis Resendiz hid quietly in a small room with dozens of classmates after gunshots erupted in a courtyard on his college campus north of Houston. There his mind quickly drifted to last month's Connecticut elementary school massacre that left 20 children dead, wondering if another gunman was on a rampage on the other side of the door. "I didn't think something like this could happen," said Resendiz, 22, who crouched in the room for about 20 minutes before being allowed to leave.