Merge r9971 from 0.5: fix self-destructing monster tacer bug (2805528).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9972 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 12, 2009
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