I'm pleased to see that not only was the Kugelblitz Challenge not a trick question (i.e. neither works and I was too dumb to figure out why) but that I successfully determined which one it was. I couldn't be arsed to draw a Penrose diagram about it, though, so I never did submit an answer. I just learned about Penrose diagrams rather recently from an earlier episode of Space Time and while I find them hauntingly beautiful I don't quite feel qualified to wrangle them myself.
It does give me a really pwntastic idea for a minimap for SE or my own game though - have an old-school radar circle but with a Penrose transformation applied so that it represents a vast swath of space but only highlights stuff as it gets close to your ship.