"Lightning can come from the sky or the ground. It can also occur sky-to-sky. It is caused by a large difference in local electrical charge. Since nature likes to be balanced, when a high charged area comes near enough to a low charged area, they balance by transferring charge in a bolt of lightning. The sheer voltage of the lightning bolt heats up the surrounding air causing it to glow. The hot air expands suddenly causing a sound wave: thunder. That's the most of what lightning is."
thx for correcting me! i knew my description was way off... <sweatdrops>
"Why shouldn't it hit unerringly?"
what i meant was that it wouldn't be so bad to "accidentally" hit a tree due to the splash damage effect of it exploding :P
EDIT: your description gives a rational explanation for how/why it could be cast indoors :P although i must admit i still like the idea of casting a powerful bolt of lightning from the heavens outdoors <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />
