Examples of "you can do this, but can't do that" for Trip would be helpful, I'm not sure for example if it applies to someone moving from the front-left to the back-left, or only if they continue on past that to another place.
There was a custom technique in Pyramid 3/61 called 'Interdiction' based on buying off some of the drawbacks of Trip I think, which might help in understanding it, as well as the initial outline Kromm did
http://forums.sjgames.com/showpost.p...9&postcount=15
your opponent must be running from in front of you to behind you (from your front hexes to your side or back hexes, on a battle map)
Drawback:
Limited target selection -- only foes running from front to back within reach (+1)
Then:
it isn't that useful except when an enemy does something odd that he probably won't do if the GM allows this technique
I don't know that the "running" necessarily implies any kind of speed, front hexes to side hexes could include a mere 1 hex of movement, so should it matter whether it's part of a step or part of a Maneuver using Movement Points?