Warlock's Shadow Walk: Conceal after attack?

[deleteme123456]

The concealment from Shadow Walk never qualifies for stealth or just the first round that you activate it? I thought Shadow Walk concealment lasted until the end of your next turn. So turn 1, you move at least 3 squares, concealment kicks in. No stealth yet because you didn't have concealment. Turn 1, move action 2, move somewhere, make stealth now if desired because you have concealment. Turn 2, concealment still active from turn 1 shadow walk, continue stealth attempts as desired. If you move at least 3 squares your concealment would continue to next round, etc etc.

What is wrong with that scenario? Just asking so I can learn the rules Not demanding people are wrong.

It's heavily debated. Some people dislike that stealth requires an absurd number of dice rolls. It's discussed at length in a very worthwhile thread here: http://www.enworld.org/showthread.php?t=230323