' s ▁staff ▁and ▁Led ▁Ze ppel in ' s ▁security ▁team ▁during ▁the ▁day , ▁and ▁as ▁Grant ▁and ▁Bind on ▁were ▁walking ▁down ▁the ▁r amp ▁near ▁the ▁end ▁of ▁the ▁concert , ▁words ▁were ▁ex changed ▁with ▁stage ▁crew ▁chief ▁Jim ▁Dow ney , ▁which ▁resulted ▁in ▁Bind on ▁knock ing ▁Dow ney ▁out ▁cold . ▁ ▁Within ▁minutes ▁a ▁separate ▁off - stage ▁incident , ▁involving ▁Graham ' s ▁security ▁man ▁Jim ▁M atz ork is ▁( who ▁was ▁accused ▁of ▁sla pping ▁Peter ▁Grant ' s ▁ 1 1 - year - old ▁son ▁Warren ▁over ▁a ▁dress ing ▁room ▁sign ), ▁es cal ated ▁into ▁an ▁all - out ▁b raw l ▁in ▁which ▁M atz ork is ▁was ▁brut ally ▁be aten . ▁Led ▁Ze ppel in ' s ▁second ▁Oak land ▁show ▁took ▁place ▁only ▁after ▁Bill ▁Graham ▁signed ▁a ▁letter ▁of ▁in dem n ification , ▁absol ving ▁Led ▁Ze ppel in ▁from ▁responsibility ▁for ▁the ▁previous ▁night ' s ▁incident . ▁However , ▁Graham ▁refused ▁to ▁honour ▁the ▁letter , ▁and ▁assault ▁charges ▁were ▁laid ▁against ▁Grant , ▁Cole , ▁Bind on , ▁and ▁John ▁Bon ham ▁when ▁the ▁band ▁arrived ▁back ▁at ▁their ▁hotel . ▁All ▁four ▁ple aded ▁n olo ▁cont end ere ▁and ▁received ▁susp ended ▁sentences . ▁Bind on ▁was ▁dismiss ed ▁by ▁Grant ▁and ▁returned ▁to ▁England . ▁Grant ▁later ▁stated ▁that ▁allowing ▁Bind on ▁to ▁be ▁h ired ▁was ▁the ▁biggest ▁mistake ▁he ▁ever ▁made ▁as ▁manager