How to shout or use other powers with the new Kinect update – without speaking

If you have Kinect configured to be your chat mic and you do not have another chat mic connected for each connected controller then Kinect will be picking up and broadcasting the audio during games.

Examples of when Kinect Mic will be used during a game: (Assumes that the "Use Kinect for Chat Mic" setting is set to "On".)

1. One controller is connected and no chat mic is connected for that controller.
2. Multiple controllers are connected and one or more controller(s) don't have a chat mic connected.

(You are probably hearing chat through your TV or sound system in these cases.)

Examples of when a Kinect Mic will not be used:

1. When the "Use Kinect for Chat Mic" settings is set to "Off".
2. When one controller is connected and there is also a chat mic connected for that controller.
3. When more than one controller is connected and there is a chat mic connected for each controller.

Ulfric is capable of shouting because he studied with the Greybeards but couldn't stand being away from the events of the war and as such left to join the Empire. He is not Dragonborn though: I think the idea is that almost anyone can learn a shout if they are super dedicated (since it takes a lot of time for non-Dovahkiin).

He also states that he Fus'd him to the floor and finished him off with a sword.

And no, there isn't a shout available to the Dovahkiin in-game that is powerful enough to disintegrate an enemy. That's not to say there isn't a possibility of one in the world of Skyrim, just that you can't learn it in the game.

Just for reference you can find some more information about Ulfric's past here.

EDIT: The Dragonborn DLC allows you to get a passive power that adds a chance for Unrelenting Force to disintegrate enemies. Thanks 3ventic! :)