last? Sting

last? Sting

If Sting is glowing when blindness gets toggled, give a new "glowing"
message.

So instead of
  Sting glows blue! [...] You can't see! [...] Sting stops quivering.
if you're still blind when the last orc goes away, or
  Sting quivers slightly. [...] You can see again. [...] Sting stops
  glowing.
if you were blind when the first orc arrived, now you'll get an
intermediate message between the second and third ones.  'Sting is
quivering' for the first case, 'Sting is glowing' for the second.
No matter how many times blindness toggles back and forth, the final
"stops glowing" or "stops quivering" will be consistent with the most
recent "is glowing" or "is quivering".