I think its just the way the shots are taken, i am sure that when you are playing it at home in less than 2 weeks after all this waiting the stormies will not look arrogant, big headed, or even alive after long!!!
I think they will look fine to us on our own screen running around after having lived for so long only to meet us then be shot & sliced into smithereens!!!
Ahem! umm...they'll be fine, and if they're not, well, just one more reason to massacre a few thousand of them!! Its hardly as if they will run out of them is it?