Tahu Nuva summened the Vahi, mask of time and slowed the Bohrok-Kal down. Instead, the Toa gave the Bohrok-Kal their powers from the symbols.
With so much power the Bohrok-Kal were defeated.
Lehvok-Kal's vacuum blast sent it soaring into space, Koharok's sonic powers and blasted into pieces, Pahrok-Kal went right through the ground. Nuhvok-Kal crumbled into a tiny pile of metal, Tahnok-Kal electricuted him self and Gahlok-Kal had uncontrolled magnetic powers and the exo-toa ruinsflew into him.
In the end the Toa Nuva got there powers back.