the Extras menu.
unroll. When you're battling a Bohrok or Bohrok-Kal as Toa Tahu
(the red one)or Gali Nuva (the blue one), they will randomly
unroll to attack you.
If you're playing as Toa Kopaka (the silver one), then you must
get close enough that the Bohrok is targeted. Then, use your
shield This will unroll the Bohrok (attack it quickly and as many
times as possible during the 3 seconds that you have before it
rolls up again).
to unlock the bionicle of light takua nuva.