Mass Effect 3 - How to use powers in the final level [360]
ATTENTION!!! mini-SPOILER
Without spoiling anything more than necessary towards the end of Mass Effect 3 there is a session where Shepard will have a gun as his only weapon and will not even have the use of powers. However, it has been discovered that with the Kinect by giving the voice commands related to the powers (launch, singularity, etc) these will work equally, in spite of what the developers had foreseen.
Now you know that if you have a Kinect you can tackle this section of the game using your powers as well.