So in D&D 4e, Monster Manual 3, there's the Pact Hag (p.108).
One of their attacks is the Compelling staff. The description says this: "Hit: 1d6 + 5 damage, and the target makes a melee basic attack as a free action against a creature of the hag's choice."
Now, my question is: can the target perform a move action to move towards the second target, before doing their melee basic attack?
The description doesn't seem to imply so. But it seems to me that, if the target cannot move at all and HAS to attack someone that's adjacent to them, then it seems to me that this Hag power is not really that great at all. Because I don't really see a lot of situations in a combat encounter in whihc two PCs will be directly adjacent one to another. It can happen sure, but it probably won't happen that often.