Need a bit of help with a villian

[Ringtail]

I'm working on a villian that I'd like to be able to have throw a net (or lasso, whatever) from horseback at a foe (possibly after overrunning prone) and drag foes behind him to damage them. Unfortunately, the rules don't really effectively cover such an act so I'd appreciate a little advice on figuring up some rules on a fair way to resolve such an act in combat.

You can succeed at an opposed Strength check to keep foes from moving beyond the length of the rope connected to the net, but there is nothing about pulling them. The drag manuever specifically mentions that its intended use is to pull someone without damaging them as well, so that avenue seems closed.

A CMB check by the rider holding the net? A CMB check by the mount that would be moving? Opposed Strength checks? A Reflex saving throw? How far would be a fair distance to pull someone in a round this way? What should the damage be (right now I'm leaning toward treating the distance pulled as falling damage, perhaps with the first 10' being nonlethal, though figuring out a acceptable distance to be able to pull someone that isn't weighted to being overpowered or useless is the trickier part)?

[Shadowdweller]

Yeah, this is one of those things that could use some more exacting rules. Like the Erinyes using, as per the monster description, their ropes to drag PCs into the air. This is kinda the sort of thing that CMB is designed to handle. I'd say treat it as a drag maneuver (performed by the rider), with extra distance allowed due to the circumstances. And some minor damage as well. Let the PC try to make an opposed strength check on their turn if they want to escape, or a drag check in their own right to unhorse the villain.

[Tirq]

I would say that it would do damage equal to falling the same distance. Maybe even less. If you drag someone 10ft. it equals 1d6 damage. 40ft. becomes 4d6 and so on and so forth. An STR check instead of Acrobatics in this case.