I did this several months ago to avoid a sanity check warning (and
consequent fuzzer panic) when an engulfer expels the hero on a full
level. I was hoping to refine it but never went back; install it
now before forgetting about it entirely.
If a chameleon changes from wall-phazer to engulfer while in a spot
the hero can't move onto and engulfs him/her, expelling the hero
after the engulfer has taken the hero's spot might be forced to put
the hero on top of the engulfer or another monster when unable to
use the engulfer's former spot. Rather than try to figure out all
the possible ways this might happen and attempt to deal with each
of them, just prevent an engulf attack from succeeding if the hero
wouldn't be able to move to the engulfer's spot. (Does not prevent
an air elemental over water from engulfing the hero.)
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