Player's Handbook page 268:
So if an enemy enters a square adjacent to you, you can push him, but then the enemy can continue moving towards you if he has hasn't used his entire movement yet (e.g. he moved 4 squares out of 6). Or can the user of the armor make sure that the enemy has finished his movement completely before invoking the power? What prevents a pushed enemy to move another square forward again?
If a creature triggers your immediate reaction while moving (by coming into range, for example), you take your action before the creature finishes moving but after it has moved at least 1 square.
So if an enemy enters a square adjacent to you, you can push him, but then the enemy can continue moving towards you if he has hasn't used his entire movement yet (e.g. he moved 4 squares out of 6). Or can the user of the armor make sure that the enemy has finished his movement completely before invoking the power? What prevents a pushed enemy to move another square forward again?