These actions consist almost entirely of designating particular lemmings as having powers selected from the list of 9 possibilities. However, the human player doesn't know the lemming interpreter, and it wouldn't do him much good if he did. What the human knows is the common sense physics of the lemming world. Epistemological adequacy requires that the facts that are actually observable be expressible and that the general facts giving the effects of actions be expressed in a way that makes the observations useful. Here are some aspects of the common sense physics of the lemming world.
Lemmings move to the right or left and sometimes climb.
I suppose lemmings cannot stand still except for blockers and have only one possible speed. Players use this fact in order to time explosions. If a lemming is triggered while at place x to explode 5 seconds later at place y , triggering at x will always result in an explosion at y . Except for blockers, lemmings don't interact with each other, e.g. they interpenetrate rather than collide. The lemming world has kinematics but apparently not dynamics.