Midway through "Cobra's Candidate", Storm Shadow tells Buzzer that Cobra Commander has sent him a communique about the pep rally, to which Buzzer replies "Come on mate; Cobra Commander knows I can't read." Per his file-card, however, Buzzer was a college professor prior to becoming a Dreadnok, and as such would most certainly know how to read.
The Dreadnoks would likely have been killed by the falling concrete.