They were expecting to get testimony out of Sam with torture that ends with a spike through the forehead?
Careful attention to almost muted dialog before that scene reveals they are trying to get him to sign the bill for the arrest, incarceration, torture and paperwork. Yes, you have to pay for your own torture in Brazil. And that is all they were after.
What does Jill see in Sam? From her perspective, he comes off as a crazed stalker more than a few times.