It's time for the Guru to help the Cooper Gang. Help him escape and destroy four drills and a grinder.
As Bentley, go to the stockade and bring the Guru's gear. Control will switch to the Guru. Wait for the kangaroo guard to come, then hold down to transform. The guard will come in and investigate. Once his back is turned, jump and press to possess the guard and ram him into the cage. Then head for the drills.
After the binocucom chat, possess any of the guards and ram them into the four drills. Once done, head over to Wave Rock. Bentley will tell you that the linked generator to a grinder can easily be destroyed. Possess a guard and press to make a guard jump. Ram guards into the generator three times and the job is complete.