I have been increasingly finding that unless I'm battling enemies on level unblemished ground (a freshly mown bowling green for example) with perfectly clear air 99 times out of 100 the game deems that I cannot see that which I want to teleport even when every other spell I could use can target the same enemy with no problems under the exact same circumstances. Are different spells using different points in 3d space as a starting point for targeting?
Some spells seem to target from the players feet and strike a prone enemy barely ankle high rather than the huge hulking mass standing further away that I was aiming at.
On one occasion an arrow fired hit an enemy to the immediate left of my character rather than the one out in front of him.

Getting back to teleport, I have had a situation where an enemy standing in a burning patch with a little smoke, no more than two metres from me, was unselectable for teleport because I "cannot see it" whereas a same school damage spell has no problem locking on to the same target.

Being able to drop an enemy into a burning area would be nice too, but thanks to the smoke 99% of such areas are unselectable due to lack of sight even though they were obviously devoid of anything prior to the fire starting.