<email deleted>, escaping from being stuck
by lava via jumping--or simply walking--got you out of the lava while being
at the same location. You could then stay there for as long as you liked
without falling back in. This makes a lava and water check on turns where
time passes but hero hasn't moved, performing a subset of spoteffects().
I think the water case only matters when using wizard mode to wish for a
pool or moat, which gets created at hero's feet without making him fall in
(unlike wishing for lava, where hero does immediately fall in).
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