Heroic acts
Liviu Librescu
held the door of his classroom shut while Cho was attempting to enter it; although he was shot through the door, he was able to prevent the gunman from entering the classroom until his students had escaped through the windows. A number of Librescu's students have called him a hero because of his actions, with one student, Asael Arad, saying that all the professor's students "lived because of him". Librescu's son, Joe, said he had received e-mails from several students who said he had saved their lives and regarded him as a hero whilst many newspapers also reported him as the hero of the massacre.
Kevin Granata went down to second floor from his third floor office of Norris Hall, where the second round of shootings in the massacre took place. It was reported by witnesses to investigators that Dr. Granata, inside either an office or a classroom with other people, heard a commotion and went into the hallway to see if he could help.
Partahi Lumbantoruan attempted to block the door from Cho's attack and gave way to the fellow students to save themselves, but was killed as a result.
Zach Petkewicz and two other classmates (fourth-year students) in another classroom - shoved a long table against the door and held it there - helping save 11 students from the massacre