define_monster() now does it.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9356 c06c8d41-db1a-0410-9941-cceddc491573
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menv[mid].speed -= 2;
if (menv[mid].speed < 3) menv[mid].speed = 3;
if (menv[mid].speed < 3)
menv[mid].speed = 3;