For you who says it's useless; You can attach it to a unit's legs. Then you make a trigger like this:
Event - Every 0.10 Seconds of gametime
Action - Move (Unit) To possision of (Unit) with polar of xx over 0.10
seconds
Event - Every 0.10 Seconds of gametime
Action - Move (Unit) To possision of (Unit) with polar of xx over 0.10
seconds
