In the anecdote the student did ask for immunity, but only after talking to a lawyer first. It was the lawyer's advice to ask for immunity. The bigger lesson w

In the anecdote the student did ask for immunity, but only after talking to a lawyer first. It was the lawyer's advice to ask for immunity. The bigger lesson was not to ask for immunity, but to refuse to say anything without your lawyer present. (...and then, obviously, to only say things if your lawyer advises you to do so.)