(Around the world deaf people started tweeting about what the man was doing, with Wilma Newhoudt-Druchen, the first deaf woman to be elected to the South African parliament tweeting: "ANC-linked interpreter on the stage with dep president of ANC is signing rubbish. He cannot sign. Please get him off." And others said it amounted to little more than "flapping his arms around."
What a shame that this happened during a memorial ceremony for a great man.
!Update - He now says he suffers from schizophrenia and was suffering an episode during the speech making.)