 Wall is particularly famous for his public rivalry with Steven Seagal, which provoked a series of challenges between the two between 1988 and 1992.It started when Seagal made disparaging commentaries about Bruce Lee, Chuck Norris and other American martial artists in interviews, culminating in two articles in the "Black Belt" magazine where he claimed he would fight to the death anybody who believed they could defeat him.Indignant at Seagal's slights of Lee and American martial artists as well by his boasts, Wall gathered a group of martial artists willing to answer the challenge, who were nicknamed the "Dirty Dozen" in a reference to the 1967 war film "The Dirty Dozen".