I know the rules on grease as regards the reflex save, the slower speed, and even standing. My question is a small but important detail about the falling bit. Some scenarios have an NPC grease a hazard like a bridge or a bridge with caltrops already on it.
Now according to the rules, fail your save - fall prone. But it appears that you always fall prone in your own square. So the ledge isn't an additional threat? Are there rules that might imply falling in a random direction other than straight down? What if your standing on a grease bridge and a goblin with a horse clopper is trying to trip you? Trip still has you fall straight down so the bridge poses no additional threat. Do the caltrops cause greater damage when you fall in them?
