monsters.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6777 c06c8d41-db1a-0410-9941-cceddc491573
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const bool invisible = YOU_KILL(beam.thrower) && !you.can_see(mon);
// Don't stop tracers on invisible monsters. && (!invisible || !beam.is_tracer)
// Don't stop tracers on invisible monsters.
&& (!invisible || !beam.is_tracer)