How to change direction of boulder

How to change direction of boulder - Boulders against narrow roads in mountains in daytime

In Dungeon Keeper II, I encountered a bonus mission, where I'm asked to 'guide' boulders from boulder traps to squash dwarves around the map. I have tried to slap them as suggested in DK wiki, but I can't see any effect.

What exactly determines the direction of a boulder when I slap it?






Pictures about "How to change direction of boulder"

How to change direction of boulder - Drone view of cars riding on curvy roadway near tall rocky cliff in dry terrain with boulders in wild nature
How to change direction of boulder - Turtles and Goldfish
How to change direction of boulder - White and Black No Smoking Sign





Bouldering Progression Series - Beginner | V2, V3




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Images: Plato Terentev, Drone Trotter, Simon Hurry, Markus Winkler