From some notes I made prior to release of 3.4.3, about applying a
carried mirror in the direction of a monster:
invisible player applying mirror toward monster which can't see invisible
should have no effect (monster can't see hero's equipment);
similarly when inside engulfer regardless of whether it can see invisible;
applying mirror at worm tail shouldn't work but does;
applying mirror toward unseen monster that can see invisible (so should be
able to see its own image) doesn't work because bhit() won't target it;
mirror shouldn't work when target is only visible via infravision.
The fourth one is iffy since it assumes that invisible monsters produce
invisible reflections rather than no reflections. The reverse of that is
probably more reasonable but isn't as interesting. The fifth one may be
contradictory; it fails to extend that logic to "infravisible monsters
produce infravisible reflections."
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