I would have added a few things to make Ben seem like he wanted Anakin to turn his back on the Sith and the Empire and so on.
Even better, I would have had Anakin make a surprise attack on Obi-Wan. Talk about having your dreams stepped on.
BEN: There's still a chance to turn your back on this, Anakin! Return to the Light, stop this madness!
ANAKIN: If you're not with me, then you're my enemy!
ANAKIN suddenly activates his lightsaber and swings at BEN, who must quick-draw his lightsaber in order to avoid being cut in half...
And then as things progress, Ben would find time to disrobe, or something. Obi-Wan was ready to go at it, which was his primary objective, but still, you think he'd be a bit more...trying to convert Anakin back. Having Anakin try to rip his face off while he's trying to sway him back to the Light Side would have been cool...