Say you have two entities, A and B, neither of which is the player, and A is set to roam around, either with a wander or a movescript. Now, you set A, the roamer, to stalk somebody else -- the player, in my case. He'll stalk properly. However, if you then set B to stalk A, B will totally spaz out. Every time A would normally have moved (before the stalk), B will inch closer to him, until he's standing right on top of A, at which point he'll spin around like a retard.