targeting a flying creature
In a recent game, a character tried the "anchor flying creature to ground with Web spell" trick. It was flying about 20 ' off the ground at the time, and was of Poor maneuverability rating.
I ruled (and I admit this was just my ruling) that he had to target the creature with a ranged touch attack roll, at significant penalties - he rolled very well (at least 12 above its touch armor class). The creature then rolled (and failed) its save to shrug off the web effects (normally an anchor doesn't get a save, though, so this was perhaps a superfluous roll).
So, the web formed, starting at the ground and stretching to the target's chest and the bottom of its wings (the largest area at the time). This lasted until the target creature arced down into the ground (as would Wile E. Coyote in a cartoon), at which point the web then collapsed upon itself, leaving a mess of strands on the ground which then disappeared.
The creature, although never "entangled", was solidly checked in its flight path, and went down. It was able to stand on its next action (not entangled) but had taken damage from the fall.
I offer this as an example of things to consider when judging the rules. At no point was I ever going to let the flying creature become "entangled," but I did rule it as a (temporary) solid object.
I wish there had already been a Sage ruling on such things.
- Devon