if the path to the target is blocked by wall. It can still bypass creatures. So it's now somewhere between Smite and Fireball. Done this way because it's the easiest fix; this spell will need some refactoring. (As does all the beam code, sigh.)
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7837 c06c8d41-db1a-0410-9941-cceddc491573
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