sentences:  Wilfried Sauerland, the manager who rescued Valuev's career from obscurity two years earlier, angrily countered that the fans had booed because Stone's in-ring behavior had agitated them.In September 2006 Ruiz announced that he would be managed by Sauerland.His former manager Norman Stone retired on December 22, 2005, stating that the decision in the loss to Valuev was the last straw, and he would continue to support Ruiz from retirement.