Somebody climbs back up through the Rope Trick. Looks just like Keltham, but he's wearing a +6 Intelligence headband and visibly has Owl's Wisdom running.
"All right," he says. "Let's negotiate. Are you willing to swear, before I reveal potentially dangerous knowledge to you, that you will not use any knowledge revealed here to you, to act against myself nor my plans, in the sense that whatever you learn from me should not cause you to take actions more damaging to my interests than you'd otherwise have taken?"