Madosh Tambwe scored two tries as the Bulls made it back-to-back wins in the Guinness PRO14 Rainbow Cup SA by beating the Stormers 20-16.
The Stormers were beaten by Sharks in their Rainbow Cup opener with injuries to Kade Wolhuter and Herschel Jantjies adding to their pain.
A Stormers side featuring two World Cup-winning Springboks have been handed a timely wake-up call after losing to the Southern Kings in a pre-season clash.
