Join Date: Sep 2007
Location: Birmingham, England
At first I thought he said "For the Emperor" but in roaring type of way, but then I played it over and over (I'm a media student specialising in TV editing so I do this often to make sure fades and cuts work) and I came to the conclusion he says "For the Empire!".
Fluff wise it's more likely to say "For the Empire" due to the fact it's a warrior priest and the Empire is Sigmar's creation and is more important than the Emperor. It's also less likely to see troopers be dedicated to the Emperor than the Empire as a while due to the different provinces.