I recently picked up the [Scavenger Bird Ki Focus](http://www.wizards.com/dndinsider/compendium/item.aspx?id=7829) for my assassin. Does the ki focus' enhancement bonus to attack and damage rolls get applied to any weapon that I am wielding?

Also, when I use its at-will power, does only the number of shrouds you have on the enemy move to a new enemy? 

Just want to make sure I'm reading it right.