But I recently realized the specific inspiration for Midnight Chaser.
Before I tell you the actual spark, first let me say that I'd written the basic premise of the story in my "bank" of ideas. But it only existed as a snippet. Didn't have the whole story by a long shot. Just a "what if" to play with... which sat around for at least two years if not three or more. One day I referred to my notes of stuff to play around with and then received flashes (presumably from Andy) to make it a full-fledged tale. But what prompted the original tidbit?