The old man is quiet for a few minutes as he considers your offer. Finally he nods."Okay, we have a deal," he says. "I just want to forget this living nightmare NOW!"

He looks fearfully around the dark forest and begins to shudder. He mumbles a little, but this time you can make out his words. "Make the bad memories stop..." It's probably best that he forgets this experience sooner rather than later.

Maybe you don't want to use a memory charm, but surely there must be something else you could do to end the poor man's nightmare.