You probably don't even know how to work the device. At best it would do nothing and at worse you'd fry the poor warden's brain. I should do the procedure, so unless you plan on blindfolding me, you might as well tell me the name of the person in question. [He is sticking with the lie that Howie has the real mindwipe. If he can get the Doctor to let him do the procedure, he can switch the mindwipes and maintain the bluff. Alas, Narvin is a well-known liar and misanthrope, so the Doctor would be justifiably suspicious of his motives.]