avoid stepping on them, and if they're flying, they'll never fall through them anyway. As for teleportation traps, maybe fleeing monsters should also head toward them if possible?
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5945 c06c8d41-db1a-0410-9941-cceddc491573
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