Sorry, guys, but the move is optional. Please see PHB2, page 219, Movement Effects sidebar.

MOVEMENT EFFECTS
Many powers allow you and your allies to move or allow you to move your enemies forcibly. If a power notes a distance that you or an ally moves (for example, "you shift 2 squares"), the character allowed to move can decide ot move all, some, or none of that distance. Similarly, if a power forcibly moves an enemy (for example, "you push the target 3 squares"), you can decide to move the enemy all, some, or none of that distance.

If a power notes the destination for your or an ally's move (for example, "a space adjacent to the target"), the charcter allowed to move decides either to move to that destination or not. You can't move partway. Similarly, if a power specifies where you force an enmy to move, you decide either to move the enemy there or not.

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