A simple statement which I'm prepared to use if my still-in friends ever confront me when they visit:
"I'm very willing for us to discuss the various scriptures which I feel are not presented as current truth by the "slave." J.W.'s are averse to discussing scriptures which another JW sees in a totally different light.
Simple example:
Brother/sister, Revelation 7:14 speaks about a "great tribulation." Do you think it's accurate to say that it refers to the great tribulation at Matthew 24:21, or would you reason that the angel is referring to the great tribulation which he'd mentioned only a few minutes earlier in his conversation with John, at Revelation 2:22? How can something which Jesus said would never occur again, have a greater fulfilment?
Rabbit-in-the-headlights moment, followed by incoherent ramblings from the cult's literature.
I wish you well as you try to help your friend see what the org is really all about.