I saw the video on sky news here in the uk earlier. Buzz (who chnged his name in 1979 IIRC) lands a solid punch on sibrel but the incident is slightly blocked be a crowd of people from the footage i saw. I did see sibrel afterwards asking the cameraman wheter he had got it all on tape. Its not clear what sibrel said to aldrin on the tape i saw either. If i had been accused by someone of lying to everyone on the planet for 30 years and been essentially ( and falsely )accused of being involved in murdering collegues then id be rather displeased with my accuser too.