You need to select the shout first.
Mad props yo. That's like calling the cable company to figure out why the TV isn't working and then someone coming along and informing you that you haven't plugged the TV in yet. Classic hilarity.
That would have been funny if you realized that after doing the quest the shout isn't assigned to the Z key initially and you have to manually select it.
So what I said to the guy was valid advice.
...OR,was shot in the knee...
seems like that would induce shouting though