Radley has no idea what Keldor is thinking, or not thinking, but he definitely sees the place growing more indistinct.

"That's good," he encourages. "Keep going. Keep thinking about the safe home ... about us going there. Everything's going to be okay. I'll be right here."

He has already helped several others, but they were okay upon leaving this place. He's not sure Keldor will be, and in fact, really fully doubts it, so this will likely be his last foray into this dimension. Keldor will still need his help when they fully leave. He will stay with Keldor.