By creating a spot of lava, filling up the whole level, and creating
a lurker above, I managed to trigger the impossible "Dismount: can't
place former steed on map" that was added earlier today. I also was
told that my god was displeased even though the engulfer's attack was
responsible. This addresses both situations. I can't trigger that
impossible any more, and only voluntary dismount blames the hero if
it's killed because there's nowhere to place it. Hero is still blamed
for any dismount that kills the steed while flying or levitating over
dangerous terrain--hero took steed into jeopardy.