paid tribute to nelson mandela, the man standing just three feet away says he was having schizophrenic hallucinations. the sign language interpreter told us he was seeing angels. when did you know something was wrong that day at the stadium? when i saw angels coming down to the stadium. reporter: you saw angels coming into the stadium? yes. reporter: he kemt going, making signs kept going, making signs we now know weren t real words. he admits he suffered many schizophrenic attacks over the years. have you had episodes in the past where you have been violent? yes, but now it s under control because i m on medication. reporter: were you on medication the day of the memorial service? absolutely. reporter: he was given accreditation by the organizers but not screened by u.s. secret service. in fact, he said he was hired just the day before for an event attended by more than 100 current and former heads of state. the south african government