During the fight scene with Wall, Lee cut himself on glass bottles that were not the sugar glass props normally used in the film industry.
Lee's famous, running thrust kick into Wall's chest at the end of their fight scene broke Wall's sternum, and broke one arm of each of two extras, into which Wall was propelled and fell. The rest of the fight (with the glass bottles) was delayed for one month, until Wall had healed well enough to perform the choreography. The kick and fall were scripted and rehearsed, but Lee was unhappy that the kick would not look real on screen. Wall exhorted Lee, "Go for it, man. I'm a professional." The result, on the eighth take, put Wall in hospital. This incident, as well as others, helped give rise to the rumour of an on-set feud between Wall and Lee, and that this feud prompted Lee to fight him for real
During the making of 'Enter the Dragon', it has been said that Lee had developed a grudge against Wall due to the cut injury he had sustained when Wall had held onto the "real glass" bottle during their fight scene (where O'Hara smashes the bottles). Wall and others deny these allegations however, stating the whole event was blown out of proportion and that it was something instigated by director