git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6021 c06c8d41-db1a-0410-9941-cceddc491573
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&& monster_can_submerge(mons, grd(pos)))
&& monster_can_submerge(mon, grd(pos)))
int mnum = mgrd(mons->pos()); mgrd(mons->pos()) = NON_MONSTER;
int mnum = mgrd(mons->pos());
mgrd(mons->pos()) = NON_MONSTER;
int mnum = mgrd(mon->pos()); mgrd(mon->pos()) = NON_MONSTER;
int mnum = mgrd(mon->pos());
mgrd(mon->pos()) = NON_MONSTER;
&& monster_habitable_grid(mons, grd(pos))
&& monster_habitable_grid(mon, grd(pos))