In 1980 Numa could not compete at the Moscow Olympic Games due to the boycott.

In 1984 at 22 he competed at the Los Angeles Olympic Games winning gold in the individual and team foil events.

[1][2] In the final for the Individual Title Numa won over Matthias Behr.

Less than 1 minute before the end Behr was 4 points up but Numa caught his opponent and eventually won in the tie break with the final score of 12-11.

[3] In the following years Numa confirmed to be one of the strongest in Foil Individual winning medals in Clermont-Ferrand 1982, in Barcelona 1985, in Sofia 1986, in Denver 1989 World Championships.