Table was heavy, and it was computer class.

Previously, a student in an engineering class used a table to block the door. Here we see a table was "heavy" and it wasn't enginneering, it was computer class....

" the kid in German class who became an eloquent voice of the survivors, to the quick-thinking student in computer class who placed a heavy table to block the doorway just in time, to the young man in mechanical engineering who made it through by pretending that he was dead." [+]

I'd like to see exactly how that was done and I'd like to know what a "heavy table" was doing in a classroom.